Merging upstream version 127.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 234 insertions, 140 deletions

diff --git a/media/libwebp/src/webp/decode.h b/media/libwebp/src/webp/decode.h
index 0177b12089..d6895f5c55 100644
--- a/media/libwebp/src/webp/decode.h
+++ b/media/libwebp/src/webp/decode.h
@@ -48,34 +48,33 @@ WEBP_EXTERN int WebPGetDecoderVersion(void);
 // RIFF + VP8X + (optional chunks) + VP8(L)
 // ALPH + VP8 <-- Not a valid WebP format: only allowed for internal purpose.
 // VP8(L)     <-- Not a valid WebP format: only allowed for internal purpose.
-WEBP_EXTERN int WebPGetInfo(const uint8_t* data, size_t data_size,
-                            int* width, int* height);
+WEBP_NODISCARD WEBP_EXTERN int WebPGetInfo(
+    const uint8_t* data, size_t data_size, int* width, int* height);
 
 // Decodes WebP images pointed to by 'data' and returns RGBA samples, along
 // with the dimensions in *width and *height. The ordering of samples in
 // memory is R, G, B, A, R, G, B, A... in scan order (endian-independent).
 // The returned pointer should be deleted calling WebPFree().
 // Returns NULL in case of error.
-WEBP_EXTERN uint8_t* WebPDecodeRGBA(const uint8_t* data, size_t data_size,
-                                    int* width, int* height);
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGBA(
+    const uint8_t* data, size_t data_size, int* width, int* height);
 
 // Same as WebPDecodeRGBA, but returning A, R, G, B, A, R, G, B... ordered data.
-WEBP_EXTERN uint8_t* WebPDecodeARGB(const uint8_t* data, size_t data_size,
-                                    int* width, int* height);
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeARGB(
+    const uint8_t* data, size_t data_size, int* width, int* height);
 
 // Same as WebPDecodeRGBA, but returning B, G, R, A, B, G, R, A... ordered data.
-WEBP_EXTERN uint8_t* WebPDecodeBGRA(const uint8_t* data, size_t data_size,
-                                    int* width, int* height);
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGRA(
+    const uint8_t* data, size_t data_size, int* width, int* height);
 
 // Same as WebPDecodeRGBA, but returning R, G, B, R, G, B... ordered data.
 // If the bitstream contains transparency, it is ignored.
-WEBP_EXTERN uint8_t* WebPDecodeRGB(const uint8_t* data, size_t data_size,
-                                   int* width, int* height);
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGB(
+    const uint8_t* data, size_t data_size, int* width, int* height);
 
 // Same as WebPDecodeRGB, but returning B, G, R, B, G, R... ordered data.
-WEBP_EXTERN uint8_t* WebPDecodeBGR(const uint8_t* data, size_t data_size,
-                                   int* width, int* height);
-
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGR(
+    const uint8_t* data, size_t data_size, int* width, int* height);
 
 // Decode WebP images pointed to by 'data' to Y'UV format(*). The pointer
 // returned is the Y samples buffer. Upon return, *u and *v will point to
@@ -87,10 +86,9 @@ WEBP_EXTERN uint8_t* WebPDecodeBGR(const uint8_t* data, size_t data_size,
 // 'width' and 'height' may be NULL, the other pointers must not be.
 // Returns NULL in case of error.
 // (*) Also named Y'CbCr. See: https://en.wikipedia.org/wiki/YCbCr
-WEBP_EXTERN uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
-                                   int* width, int* height,
-                                   uint8_t** u, uint8_t** v,
-                                   int* stride, int* uv_stride);
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeYUV(
+    const uint8_t* data, size_t data_size, int* width, int* height,
+    uint8_t** u, uint8_t** v, int* stride, int* uv_stride);
 
 // These five functions are variants of the above ones, that decode the image
 // directly into a pre-allocated buffer 'output_buffer'. The maximum storage
@@ -100,22 +98,22 @@ WEBP_EXTERN uint8_t* WebPDecodeYUV(const uint8_t* data, size_t data_size,
 // The parameter 'output_stride' specifies the distance (in bytes)
 // between scanlines. Hence, output_buffer_size is expected to be at least
 // output_stride x picture-height.
-WEBP_EXTERN uint8_t* WebPDecodeRGBAInto(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGBAInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
-WEBP_EXTERN uint8_t* WebPDecodeARGBInto(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeARGBInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
-WEBP_EXTERN uint8_t* WebPDecodeBGRAInto(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGRAInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
 
 // RGB and BGR variants. Here too the transparency information, if present,
 // will be dropped and ignored.
-WEBP_EXTERN uint8_t* WebPDecodeRGBInto(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeRGBInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
-WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
     const uint8_t* data, size_t data_size,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
 
@@ -126,7 +124,7 @@ WEBP_EXTERN uint8_t* WebPDecodeBGRInto(
 // 'u_size' and 'v_size' respectively.
 // Pointer to the luma plane ('*luma') is returned or NULL if an error occurred
 // during decoding (or because some buffers were found to be too small).
-WEBP_EXTERN uint8_t* WebPDecodeYUVInto(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPDecodeYUVInto(
     const uint8_t* data, size_t data_size,
     uint8_t* luma, size_t luma_size, int luma_stride,
     uint8_t* u, size_t u_size, int u_stride,
@@ -217,11 +215,11 @@ struct WebPDecBuffer {
 };
 
 // Internal, version-checked, entry point
-WEBP_EXTERN int WebPInitDecBufferInternal(WebPDecBuffer*, int);
+WEBP_NODISCARD WEBP_EXTERN int WebPInitDecBufferInternal(WebPDecBuffer*, int);
 
 // Initialize the structure as empty. Must be called before any other use.
 // Returns false in case of version mismatch
-static WEBP_INLINE int WebPInitDecBuffer(WebPDecBuffer* buffer) {
+WEBP_NODISCARD static WEBP_INLINE int WebPInitDecBuffer(WebPDecBuffer* buffer) {
   return WebPInitDecBufferInternal(buffer, WEBP_DECODER_ABI_VERSION);
 }
 
@@ -232,7 +230,7 @@ WEBP_EXTERN void WebPFreeDecBuffer(WebPDecBuffer* buffer);
 //------------------------------------------------------------------------------
 // Enumeration of the status codes
 
-typedef enum VP8StatusCode {
+typedef enum WEBP_NODISCARD VP8StatusCode {
   VP8_STATUS_OK = 0,
   VP8_STATUS_OUT_OF_MEMORY,
   VP8_STATUS_INVALID_PARAM,
@@ -251,23 +249,24 @@ typedef enum VP8StatusCode {
 // WebPIDecoder object. This object can be left in a SUSPENDED state if the
 // picture is only partially decoded, pending additional input.
 // Code example:
-//
-//   WebPInitDecBuffer(&output_buffer);
-//   output_buffer.colorspace = mode;
-//   ...
-//   WebPIDecoder* idec = WebPINewDecoder(&output_buffer);
-//   while (additional_data_is_available) {
-//     // ... (get additional data in some new_data[] buffer)
-//     status = WebPIAppend(idec, new_data, new_data_size);
-//     if (status != VP8_STATUS_OK && status != VP8_STATUS_SUSPENDED) {
-//       break;    // an error occurred.
-//     }
-//
-//     // The above call decodes the current available buffer.
-//     // Part of the image can now be refreshed by calling
-//     // WebPIDecGetRGB()/WebPIDecGetYUVA() etc.
-//   }
-//   WebPIDelete(idec);
+/*
+     WebPInitDecBuffer(&output_buffer);
+     output_buffer.colorspace = mode;
+     ...
+     WebPIDecoder* idec = WebPINewDecoder(&output_buffer);
+     while (additional_data_is_available) {
+       // ... (get additional data in some new_data[] buffer)
+       status = WebPIAppend(idec, new_data, new_data_size);
+       if (status != VP8_STATUS_OK && status != VP8_STATUS_SUSPENDED) {
+         break;    // an error occurred.
+       }
+
+       // The above call decodes the current available buffer.
+       // Part of the image can now be refreshed by calling
+       // WebPIDecGetRGB()/WebPIDecGetYUVA() etc.
+     }
+     WebPIDelete(idec);
+*/
 
 // Creates a new incremental decoder with the supplied buffer parameter.
 // This output_buffer can be passed NULL, in which case a default output buffer
@@ -281,7 +280,8 @@ typedef enum VP8StatusCode {
 // within valid bounds.
 // All other fields of WebPDecBuffer MUST remain constant between calls.
 // Returns NULL if the allocation failed.
-WEBP_EXTERN WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer);
+WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewDecoder(
+    WebPDecBuffer* output_buffer);
 
 // This function allocates and initializes an incremental-decoder object, which
 // will output the RGB/A samples specified by 'csp' into a preallocated
@@ -293,7 +293,7 @@ WEBP_EXTERN WebPIDecoder* WebPINewDecoder(WebPDecBuffer* output_buffer);
 // colorspace 'csp' is taken into account for allocating this buffer. All other
 // parameters are ignored.
 // Returns NULL if the allocation failed, or if some parameters are invalid.
-WEBP_EXTERN WebPIDecoder* WebPINewRGB(
+WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewRGB(
     WEBP_CSP_MODE csp,
     uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
 
@@ -308,7 +308,7 @@ WEBP_EXTERN WebPIDecoder* WebPINewRGB(
 // In this case, the output buffer will be automatically allocated (using
 // MODE_YUVA) when decoding starts. All parameters are then ignored.
 // Returns NULL if the allocation failed or if a parameter is invalid.
-WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
+WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
     uint8_t* luma, size_t luma_size, int luma_stride,
     uint8_t* u, size_t u_size, int u_stride,
     uint8_t* v, size_t v_size, int v_stride,
@@ -316,7 +316,7 @@ WEBP_EXTERN WebPIDecoder* WebPINewYUVA(
 
 // Deprecated version of the above, without the alpha plane.
 // Kept for backward compatibility.
-WEBP_EXTERN WebPIDecoder* WebPINewYUV(
+WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPINewYUV(
     uint8_t* luma, size_t luma_size, int luma_stride,
     uint8_t* u, size_t u_size, int u_stride,
     uint8_t* v, size_t v_size, int v_stride);
@@ -346,21 +346,21 @@ WEBP_EXTERN VP8StatusCode WebPIUpdate(
 // (*last_y, *width etc.) can be NULL if corresponding information is not
 // needed. The values in these pointers are only valid on successful (non-NULL)
 // return.
-WEBP_EXTERN uint8_t* WebPIDecGetRGB(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPIDecGetRGB(
     const WebPIDecoder* idec, int* last_y,
     int* width, int* height, int* stride);
 
 // Same as above function to get a YUVA image. Returns pointer to the luma
 // plane or NULL in case of error. If there is no alpha information
 // the alpha pointer '*a' will be returned NULL.
-WEBP_EXTERN uint8_t* WebPIDecGetYUVA(
+WEBP_NODISCARD WEBP_EXTERN uint8_t* WebPIDecGetYUVA(
     const WebPIDecoder* idec, int* last_y,
     uint8_t** u, uint8_t** v, uint8_t** a,
     int* width, int* height, int* stride, int* uv_stride, int* a_stride);
 
 // Deprecated alpha-less version of WebPIDecGetYUVA(): it will ignore the
 // alpha information (if present). Kept for backward compatibility.
-static WEBP_INLINE uint8_t* WebPIDecGetYUV(
+WEBP_NODISCARD static WEBP_INLINE uint8_t* WebPIDecGetYUV(
     const WebPIDecoder* idec, int* last_y, uint8_t** u, uint8_t** v,
     int* width, int* height, int* stride, int* uv_stride) {
   return WebPIDecGetYUVA(idec, last_y, u, v, NULL, width, height,
@@ -373,7 +373,7 @@ static WEBP_INLINE uint8_t* WebPIDecGetYUV(
 // Returns NULL in case the incremental decoder object is in an invalid state.
 // Otherwise returns the pointer to the internal representation. This structure
 // is read-only, tied to WebPIDecoder's lifespan and should not be modified.
-WEBP_EXTERN const WebPDecBuffer* WebPIDecodedArea(
+WEBP_NODISCARD WEBP_EXTERN const WebPDecBuffer* WebPIDecodedArea(
     const WebPIDecoder* idec, int* left, int* top, int* width, int* height);
 
 //------------------------------------------------------------------------------
@@ -389,7 +389,7 @@ WEBP_EXTERN const WebPDecBuffer* WebPIDecodedArea(
      CHECK(WebPGetFeatures(data, data_size, &config.input) == VP8_STATUS_OK);
 
      // C) Adjust 'config', if needed
-     config.no_fancy_upsampling = 1;
+     config.options.no_fancy_upsampling = 1;
      config.output.colorspace = MODE_BGRA;
      // etc.
 
@@ -468,12 +468,14 @@ struct WebPDecoderConfig {
 };
 
 // Internal, version-checked, entry point
-WEBP_EXTERN int WebPInitDecoderConfigInternal(WebPDecoderConfig*, int);
+WEBP_NODISCARD WEBP_EXTERN int WebPInitDecoderConfigInternal(WebPDecoderConfig*,
+                                                             int);
 
 // Initialize the configuration as empty. This function must always be
 // called first, unless WebPGetFeatures() is to be called.
 // Returns false in case of mismatched version.
-static WEBP_INLINE int WebPInitDecoderConfig(WebPDecoderConfig* config) {
+WEBP_NODISCARD static WEBP_INLINE int WebPInitDecoderConfig(
+    WebPDecoderConfig* config) {
   return WebPInitDecoderConfigInternal(config, WEBP_DECODER_ABI_VERSION);
 }
 
@@ -488,8 +490,8 @@ static WEBP_INLINE int WebPInitDecoderConfig(WebPDecoderConfig* config) {
 // The return WebPIDecoder object must always be deleted calling WebPIDelete().
 // Returns NULL in case of error (and config->status will then reflect
 // the error condition, if available).
-WEBP_EXTERN WebPIDecoder* WebPIDecode(const uint8_t* data, size_t data_size,
-                                      WebPDecoderConfig* config);
+WEBP_NODISCARD WEBP_EXTERN WebPIDecoder* WebPIDecode(
+    const uint8_t* data, size_t data_size, WebPDecoderConfig* config);
 
 // Non-incremental version. This version decodes the full data at once, taking
 // 'config' into account. Returns decoding status (which should be VP8_STATUS_OK
diff --git a/media/libwebp/src/webp/demux.h b/media/libwebp/src/webp/demux.h
index 846eeb15a9..8d246550ca 100644
--- a/media/libwebp/src/webp/demux.h
+++ b/media/libwebp/src/webp/demux.h
@@ -50,6 +50,7 @@
 
 #include "./decode.h"     // for WEBP_CSP_MODE
 #include "./mux_types.h"
+#include "./types.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -85,13 +86,13 @@ typedef enum WebPDemuxState {
 } WebPDemuxState;
 
 // Internal, version-checked, entry point
-WEBP_EXTERN WebPDemuxer* WebPDemuxInternal(
+WEBP_NODISCARD WEBP_EXTERN WebPDemuxer* WebPDemuxInternal(
     const WebPData*, int, WebPDemuxState*, int);
 
 // Parses the full WebP file given by 'data'. For single images the WebP file
 // header alone or the file header and the chunk header may be absent.
 // Returns a WebPDemuxer object on successful parse, NULL otherwise.
-static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
+WEBP_NODISCARD static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
   return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
 }
 
@@ -103,7 +104,7 @@ static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* data) {
 // If this data is volatile, the demuxer object should be deleted (by calling
 // WebPDemuxDelete()) and WebPDemuxPartial() called again on the new data.
 // This is usually an inexpensive operation.
-static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
+WEBP_NODISCARD static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
     const WebPData* data, WebPDemuxState* state) {
   return WebPDemuxInternal(data, 1, state, WEBP_DEMUX_ABI_VERSION);
 }
@@ -164,14 +165,14 @@ struct WebPIterator {
 // Returns false if 'dmux' is NULL or frame 'frame_number' is not present.
 // Call WebPDemuxReleaseIterator() when use of the iterator is complete.
 // NOTE: 'dmux' must persist for the lifetime of 'iter'.
-WEBP_EXTERN int WebPDemuxGetFrame(
+WEBP_NODISCARD WEBP_EXTERN int WebPDemuxGetFrame(
     const WebPDemuxer* dmux, int frame_number, WebPIterator* iter);
 
 // Sets 'iter->fragment' to point to the next ('iter->frame_num' + 1) or
 // previous ('iter->frame_num' - 1) frame. These functions do not loop.
 // Returns true on success, false otherwise.
-WEBP_EXTERN int WebPDemuxNextFrame(WebPIterator* iter);
-WEBP_EXTERN int WebPDemuxPrevFrame(WebPIterator* iter);
+WEBP_NODISCARD WEBP_EXTERN int WebPDemuxNextFrame(WebPIterator* iter);
+WEBP_NODISCARD WEBP_EXTERN int WebPDemuxPrevFrame(WebPIterator* iter);
 
 // Releases any memory associated with 'iter'.
 // Must be called before any subsequent calls to WebPDemuxGetChunk() on the same
@@ -202,15 +203,16 @@ struct WebPChunkIterator {
 // payloads are accessed through WebPDemuxGetFrame() and related functions.
 // Call WebPDemuxReleaseChunkIterator() when use of the iterator is complete.
 // NOTE: 'dmux' must persist for the lifetime of the iterator.
-WEBP_EXTERN int WebPDemuxGetChunk(const WebPDemuxer* dmux,
-                                  const char fourcc[4], int chunk_number,
-                                  WebPChunkIterator* iter);
+WEBP_NODISCARD WEBP_EXTERN int WebPDemuxGetChunk(const WebPDemuxer* dmux,
+                                                 const char fourcc[4],
+                                                 int chunk_number,
+                                                 WebPChunkIterator* iter);
 
 // Sets 'iter->chunk' to point to the next ('iter->chunk_num' + 1) or previous
 // ('iter->chunk_num' - 1) chunk. These functions do not loop.
 // Returns true on success, false otherwise.
-WEBP_EXTERN int WebPDemuxNextChunk(WebPChunkIterator* iter);
-WEBP_EXTERN int WebPDemuxPrevChunk(WebPChunkIterator* iter);
+WEBP_NODISCARD WEBP_EXTERN int WebPDemuxNextChunk(WebPChunkIterator* iter);
+WEBP_NODISCARD WEBP_EXTERN int WebPDemuxPrevChunk(WebPChunkIterator* iter);
 
 // Releases any memory associated with 'iter'.
 // Must be called before destroying the associated WebPDemuxer with
@@ -257,21 +259,21 @@ struct WebPAnimDecoderOptions {
 };
 
 // Internal, version-checked, entry point.
-WEBP_EXTERN int WebPAnimDecoderOptionsInitInternal(
+WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderOptionsInitInternal(
     WebPAnimDecoderOptions*, int);
 
 // Should always be called, to initialize a fresh WebPAnimDecoderOptions
 // structure before modification. Returns false in case of version mismatch.
 // WebPAnimDecoderOptionsInit() must have succeeded before using the
 // 'dec_options' object.
-static WEBP_INLINE int WebPAnimDecoderOptionsInit(
+WEBP_NODISCARD static WEBP_INLINE int WebPAnimDecoderOptionsInit(
     WebPAnimDecoderOptions* dec_options) {
   return WebPAnimDecoderOptionsInitInternal(dec_options,
                                             WEBP_DEMUX_ABI_VERSION);
 }
 
 // Internal, version-checked, entry point.
-WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
+WEBP_NODISCARD WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
     const WebPData*, const WebPAnimDecoderOptions*, int);
 
 // Creates and initializes a WebPAnimDecoder object.
@@ -284,7 +286,7 @@ WEBP_EXTERN WebPAnimDecoder* WebPAnimDecoderNewInternal(
 // Returns:
 //   A pointer to the newly created WebPAnimDecoder object, or NULL in case of
 //   parsing error, invalid option or memory error.
-static WEBP_INLINE WebPAnimDecoder* WebPAnimDecoderNew(
+WEBP_NODISCARD static WEBP_INLINE WebPAnimDecoder* WebPAnimDecoderNew(
     const WebPData* webp_data, const WebPAnimDecoderOptions* dec_options) {
   return WebPAnimDecoderNewInternal(webp_data, dec_options,
                                     WEBP_DEMUX_ABI_VERSION);
@@ -306,8 +308,8 @@ struct WebPAnimInfo {
 //   info - (out) global information fetched from the animation.
 // Returns:
 //   True on success.
-WEBP_EXTERN int WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
-                                       WebPAnimInfo* info);
+WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderGetInfo(
+    const WebPAnimDecoder* dec, WebPAnimInfo* info);
 
 // Fetch the next frame from 'dec' based on options supplied to
 // WebPAnimDecoderNew(). This will be a fully reconstructed canvas of size
@@ -321,8 +323,9 @@ WEBP_EXTERN int WebPAnimDecoderGetInfo(const WebPAnimDecoder* dec,
 // Returns:
 //   False if any of the arguments are NULL, or if there is a parsing or
 //   decoding error, or if there are no more frames. Otherwise, returns true.
-WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
-                                       uint8_t** buf, int* timestamp);
+WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
+                                                      uint8_t** buf,
+                                                      int* timestamp);
 
 // Check if there are more frames left to decode.
 // Parameters:
@@ -330,7 +333,8 @@ WEBP_EXTERN int WebPAnimDecoderGetNext(WebPAnimDecoder* dec,
 // Returns:
 //   True if 'dec' is not NULL and some frames are yet to be decoded.
 //   Otherwise, returns false.
-WEBP_EXTERN int WebPAnimDecoderHasMoreFrames(const WebPAnimDecoder* dec);
+WEBP_NODISCARD WEBP_EXTERN int WebPAnimDecoderHasMoreFrames(
+    const WebPAnimDecoder* dec);
 
 // Resets the WebPAnimDecoder object, so that next call to
 // WebPAnimDecoderGetNext() will restart decoding from 1st frame. This would be
@@ -348,7 +352,7 @@ WEBP_EXTERN void WebPAnimDecoderReset(WebPAnimDecoder* dec);
 //
 // Parameters:
 //   dec - (in) decoder instance from which the demuxer object is to be fetched.
-WEBP_EXTERN const WebPDemuxer* WebPAnimDecoderGetDemuxer(
+WEBP_NODISCARD WEBP_EXTERN const WebPDemuxer* WebPAnimDecoderGetDemuxer(
     const WebPAnimDecoder* dec);
 
 // Deletes the WebPAnimDecoder object.
diff --git a/media/libwebp/src/webp/encode.h b/media/libwebp/src/webp/encode.h
index 56b68e2f10..f3d59297c8 100644
--- a/media/libwebp/src/webp/encode.h
+++ b/media/libwebp/src/webp/encode.h
@@ -164,13 +164,14 @@ typedef enum WebPPreset {
 } WebPPreset;
 
 // Internal, version-checked, entry point
-WEBP_EXTERN int WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int);
+WEBP_NODISCARD WEBP_EXTERN int WebPConfigInitInternal(WebPConfig*, WebPPreset,
+                                                      float, int);
 
 // Should always be called, to initialize a fresh WebPConfig structure before
 // modification. Returns false in case of version mismatch. WebPConfigInit()
 // must have succeeded before using the 'config' object.
 // Note that the default values are lossless=0 and quality=75.
-static WEBP_INLINE int WebPConfigInit(WebPConfig* config) {
+WEBP_NODISCARD static WEBP_INLINE int WebPConfigInit(WebPConfig* config) {
   return WebPConfigInitInternal(config, WEBP_PRESET_DEFAULT, 75.f,
                                 WEBP_ENCODER_ABI_VERSION);
 }
@@ -179,8 +180,9 @@ static WEBP_INLINE int WebPConfigInit(WebPConfig* config) {
 // set of parameters (referred to by 'preset') and a given quality factor.
 // This function can be called as a replacement to WebPConfigInit(). Will
 // return false in case of error.
-static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
-                                        WebPPreset preset, float quality) {
+WEBP_NODISCARD static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
+                                                       WebPPreset preset,
+                                                       float quality) {
   return WebPConfigInitInternal(config, preset, quality,
                                 WEBP_ENCODER_ABI_VERSION);
 }
@@ -191,11 +193,12 @@ static WEBP_INLINE int WebPConfigPreset(WebPConfig* config,
 // speed and final compressed size.
 // This function will overwrite several fields from config: 'method', 'quality'
 // and 'lossless'. Returns false in case of parameter error.
-WEBP_EXTERN int WebPConfigLosslessPreset(WebPConfig* config, int level);
+WEBP_NODISCARD WEBP_EXTERN int WebPConfigLosslessPreset(WebPConfig* config,
+                                                        int level);
 
 // Returns true if 'config' is non-NULL and all configuration parameters are
 // within their valid ranges.
-WEBP_EXTERN int WebPValidateConfig(const WebPConfig* config);
+WEBP_NODISCARD WEBP_EXTERN int WebPValidateConfig(const WebPConfig* config);
 
 //------------------------------------------------------------------------------
 // Input / Output
@@ -255,8 +258,8 @@ WEBP_EXTERN void WebPMemoryWriterClear(WebPMemoryWriter* writer);
 // The custom writer to be used with WebPMemoryWriter as custom_ptr. Upon
 // completion, writer.mem and writer.size will hold the coded data.
 // writer.mem must be freed by calling WebPMemoryWriterClear.
-WEBP_EXTERN int WebPMemoryWrite(const uint8_t* data, size_t data_size,
-                                const WebPPicture* picture);
+WEBP_NODISCARD WEBP_EXTERN int WebPMemoryWrite(
+    const uint8_t* data, size_t data_size, const WebPPicture* picture);
 
 // Progress hook, called from time to time to report progress. It can return
 // false to request an abort of the encoding process, or true otherwise if
@@ -364,13 +367,13 @@ struct WebPPicture {
 };
 
 // Internal, version-checked, entry point
-WEBP_EXTERN int WebPPictureInitInternal(WebPPicture*, int);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureInitInternal(WebPPicture*, int);
 
 // Should always be called, to initialize the structure. Returns false in case
 // of version mismatch. WebPPictureInit() must have succeeded before using the
 // 'picture' object.
 // Note that, by default, use_argb is false and colorspace is WEBP_YUV420.
-static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
+WEBP_NODISCARD static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
   return WebPPictureInitInternal(picture, WEBP_ENCODER_ABI_VERSION);
 }
 
@@ -381,7 +384,7 @@ static WEBP_INLINE int WebPPictureInit(WebPPicture* picture) {
 // Allocate y/u/v buffers as per colorspace/width/height specification.
 // Note! This function will free the previous buffer if needed.
 // Returns false in case of memory error.
-WEBP_EXTERN int WebPPictureAlloc(WebPPicture* picture);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureAlloc(WebPPicture* picture);
 
 // Release the memory allocated by WebPPictureAlloc() or WebPPictureImport*().
 // Note that this function does _not_ free the memory used by the 'picture'
@@ -394,7 +397,8 @@ WEBP_EXTERN void WebPPictureFree(WebPPicture* picture);
 // will fully own the copied pixels (this is not a view). The 'dst' picture need
 // not be initialized as its content is overwritten.
 // Returns false in case of memory allocation error.
-WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src,
+                                               WebPPicture* dst);
 
 // Compute the single distortion for packed planes of samples.
 // 'src' will be compared to 'ref', and the raw distortion stored into
@@ -403,19 +407,18 @@ WEBP_EXTERN int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst);
 // 'x_step' is the horizontal stride (in bytes) between samples.
 // 'src/ref_stride' is the byte distance between rows.
 // Returns false in case of error (bad parameter, memory allocation error, ...).
-WEBP_EXTERN int WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
-                                    const uint8_t* ref, size_t ref_stride,
-                                    int width, int height,
-                                    size_t x_step,
-                                    int type,   // 0 = PSNR, 1 = SSIM, 2 = LSIM
-                                    float* distortion, float* result);
+WEBP_NODISCARD WEBP_EXTERN int WebPPlaneDistortion(
+    const uint8_t* src, size_t src_stride,
+    const uint8_t* ref, size_t ref_stride, int width, int height, size_t x_step,
+    int type,  // 0 = PSNR, 1 = SSIM, 2 = LSIM
+    float* distortion, float* result);
 
 // Compute PSNR, SSIM or LSIM distortion metric between two pictures. Results
 // are in dB, stored in result[] in the B/G/R/A/All order. The distortion is
 // always performed using ARGB samples. Hence if the input is YUV(A), the
 // picture will be internally converted to ARGB (just for the measurement).
 // Warning: this function is rather CPU-intensive.
-WEBP_EXTERN int WebPPictureDistortion(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureDistortion(
     const WebPPicture* src, const WebPPicture* ref,
     int metric_type,           // 0 = PSNR, 1 = SSIM, 2 = LSIM
     float result[5]);
@@ -428,8 +431,8 @@ WEBP_EXTERN int WebPPictureDistortion(
 // must be fully be comprised inside the 'src' source picture. If the source
 // picture uses the YUV420 colorspace, the top and left coordinates will be
 // snapped to even values.
-WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture,
-                                int left, int top, int width, int height);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureCrop(
+    WebPPicture* picture, int left, int top, int width, int height);
 
 // Extracts a view from 'src' picture into 'dst'. The rectangle for the view
 // is defined by the top-left corner pixel coordinates (left, top) as well
@@ -442,9 +445,9 @@ WEBP_EXTERN int WebPPictureCrop(WebPPicture* picture,
 // with WebPPictureInit() if it is different from 'src', since its content will
 // be overwritten.
 // Returns false in case of invalid parameters.
-WEBP_EXTERN int WebPPictureView(const WebPPicture* src,
-                                int left, int top, int width, int height,
-                                WebPPicture* dst);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureView(
+    const WebPPicture* src, int left, int top, int width, int height,
+    WebPPicture* dst);
 
 // Returns true if the 'picture' is actually a view and therefore does
 // not own the memory for pixels.
@@ -455,29 +458,30 @@ WEBP_EXTERN int WebPPictureIsView(const WebPPicture* picture);
 // dimension will be calculated preserving the aspect ratio.
 // No gamma correction is applied.
 // Returns false in case of error (invalid parameter or insufficient memory).
-WEBP_EXTERN int WebPPictureRescale(WebPPicture* picture, int width, int height);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureRescale(WebPPicture* picture,
+                                                  int width, int height);
 
 // Colorspace conversion function to import RGB samples.
 // Previous buffer will be free'd, if any.
 // *rgb buffer should have a size of at least height * rgb_stride.
 // Returns false in case of memory error.
-WEBP_EXTERN int WebPPictureImportRGB(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportRGB(
     WebPPicture* picture, const uint8_t* rgb, int rgb_stride);
 // Same, but for RGBA buffer.
-WEBP_EXTERN int WebPPictureImportRGBA(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportRGBA(
     WebPPicture* picture, const uint8_t* rgba, int rgba_stride);
 // Same, but for RGBA buffer. Imports the RGB direct from the 32-bit format
 // input buffer ignoring the alpha channel. Avoids needing to copy the data
 // to a temporary 24-bit RGB buffer to import the RGB only.
-WEBP_EXTERN int WebPPictureImportRGBX(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportRGBX(
     WebPPicture* picture, const uint8_t* rgbx, int rgbx_stride);
 
 // Variants of the above, but taking BGR(A|X) input.
-WEBP_EXTERN int WebPPictureImportBGR(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportBGR(
     WebPPicture* picture, const uint8_t* bgr, int bgr_stride);
-WEBP_EXTERN int WebPPictureImportBGRA(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportBGRA(
     WebPPicture* picture, const uint8_t* bgra, int bgra_stride);
-WEBP_EXTERN int WebPPictureImportBGRX(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureImportBGRX(
     WebPPicture* picture, const uint8_t* bgrx, int bgrx_stride);
 
 // Converts picture->argb data to the YUV420A format. The 'colorspace'
@@ -486,24 +490,24 @@ WEBP_EXTERN int WebPPictureImportBGRX(
 // non-opaque transparent values is detected, and 'colorspace' will be
 // adjusted accordingly. Note that this method is lossy.
 // Returns false in case of error.
-WEBP_EXTERN int WebPPictureARGBToYUVA(WebPPicture* picture,
-                                      WebPEncCSP /*colorspace = WEBP_YUV420*/);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureARGBToYUVA(
+    WebPPicture* picture, WebPEncCSP /*colorspace = WEBP_YUV420*/);
 
 // Same as WebPPictureARGBToYUVA(), but the conversion is done using
 // pseudo-random dithering with a strength 'dithering' between
 // 0.0 (no dithering) and 1.0 (maximum dithering). This is useful
 // for photographic picture.
-WEBP_EXTERN int WebPPictureARGBToYUVADithered(
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureARGBToYUVADithered(
     WebPPicture* picture, WebPEncCSP colorspace, float dithering);
 
-// Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion.
+// Performs 'sharp' RGBA->YUVA420 downsampling and colorspace conversion
 // Downsampling is handled with extra care in case of color clipping. This
 // method is roughly 2x slower than WebPPictureARGBToYUVA() but produces better
 // and sharper YUV representation.
 // Returns false in case of error.
-WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureSharpARGBToYUVA(WebPPicture* picture);
 // kept for backward compatibility:
-WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);
 
 // Converts picture->yuv to picture->argb and sets picture->use_argb to true.
 // The input format must be YUV_420 or YUV_420A. The conversion from YUV420 to
@@ -511,7 +515,7 @@ WEBP_EXTERN int WebPPictureSmartARGBToYUVA(WebPPicture* picture);
 // Note that the use of this colorspace is discouraged if one has access to the
 // raw ARGB samples, since using YUV420 is comparatively lossy.
 // Returns false in case of error.
-WEBP_EXTERN int WebPPictureYUVAToARGB(WebPPicture* picture);
+WEBP_NODISCARD WEBP_EXTERN int WebPPictureYUVAToARGB(WebPPicture* picture);
 
 // Helper function: given a width x height plane of RGBA or YUV(A) samples
 // clean-up or smoothen the YUV or RGB samples under fully transparent area,
@@ -541,7 +545,8 @@ WEBP_EXTERN void WebPBlendAlpha(WebPPicture* picture, uint32_t background_rgb);
 // the former for lossy encoding, and the latter for lossless encoding
 // (when config.lossless is true). Automatic conversion from one format to
 // another is provided but they both incur some loss.
-WEBP_EXTERN int WebPEncode(const WebPConfig* config, WebPPicture* picture);
+WEBP_NODISCARD WEBP_EXTERN int WebPEncode(const WebPConfig* config,
+                                          WebPPicture* picture);
 
 //------------------------------------------------------------------------------
 
diff --git a/media/libwebp/src/webp/mux.h b/media/libwebp/src/webp/mux.h
index 7d27489a40..8fb067e435 100644
--- a/media/libwebp/src/webp/mux.h
+++ b/media/libwebp/src/webp/mux.h
@@ -16,12 +16,13 @@
 #define WEBP_WEBP_MUX_H_
 
 #include "./mux_types.h"
+#include "./types.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#define WEBP_MUX_ABI_VERSION 0x0108        // MAJOR(8b) + MINOR(8b)
+#define WEBP_MUX_ABI_VERSION 0x0109        // MAJOR(8b) + MINOR(8b)
 
 //------------------------------------------------------------------------------
 // Mux API
@@ -70,7 +71,7 @@ typedef struct WebPMuxAnimParams WebPMuxAnimParams;
 typedef struct WebPAnimEncoderOptions WebPAnimEncoderOptions;
 
 // Error codes
-typedef enum WebPMuxError {
+typedef enum WEBP_NODISCARD WebPMuxError {
   WEBP_MUX_OK                 =  1,
   WEBP_MUX_NOT_FOUND          =  0,
   WEBP_MUX_INVALID_ARGUMENT   = -1,
@@ -104,13 +105,13 @@ WEBP_EXTERN int WebPGetMuxVersion(void);
 // Life of a Mux object
 
 // Internal, version-checked, entry point
-WEBP_EXTERN WebPMux* WebPNewInternal(int);
+WEBP_NODISCARD WEBP_EXTERN WebPMux* WebPNewInternal(int);
 
 // Creates an empty mux object.
 // Returns:
 //   A pointer to the newly created empty mux object.
 //   Or NULL in case of memory error.
-static WEBP_INLINE WebPMux* WebPMuxNew(void) {
+WEBP_NODISCARD static WEBP_INLINE WebPMux* WebPMuxNew(void) {
   return WebPNewInternal(WEBP_MUX_ABI_VERSION);
 }
 
@@ -123,18 +124,21 @@ WEBP_EXTERN void WebPMuxDelete(WebPMux* mux);
 // Mux creation.
 
 // Internal, version-checked, entry point
-WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int, int);
+WEBP_NODISCARD WEBP_EXTERN WebPMux* WebPMuxCreateInternal(const WebPData*, int,
+                                                          int);
 
 // Creates a mux object from raw data given in WebP RIFF format.
 // Parameters:
 //   bitstream - (in) the bitstream data in WebP RIFF format
 //   copy_data - (in) value 1 indicates given data WILL be copied to the mux
-//               object and value 0 indicates data will NOT be copied.
+//               object and value 0 indicates data will NOT be copied. If the
+//               data is not copied, it must exist for the lifetime of the
+//               mux object.
 // Returns:
 //   A pointer to the mux object created from given data - on success.
 //   NULL - In case of invalid data or memory error.
-static WEBP_INLINE WebPMux* WebPMuxCreate(const WebPData* bitstream,
-                                          int copy_data) {
+WEBP_NODISCARD static WEBP_INLINE WebPMux* WebPMuxCreate(
+    const WebPData* bitstream, int copy_data) {
   return WebPMuxCreateInternal(bitstream, copy_data, WEBP_MUX_ABI_VERSION);
 }
 
@@ -154,7 +158,9 @@ static WEBP_INLINE WebPMux* WebPMuxCreate(const WebPData* bitstream,
 //                 e.g., "ICCP", "XMP ", "EXIF" etc.
 //   chunk_data - (in) the chunk data to be added
 //   copy_data - (in) value 1 indicates given data WILL be copied to the mux
-//               object and value 0 indicates data will NOT be copied.
+//               object and value 0 indicates data will NOT be copied. If the
+//               data is not copied, it must exist until a call to
+//               WebPMuxAssemble() is made.
 // Returns:
 //   WEBP_MUX_INVALID_ARGUMENT - if mux, fourcc or chunk_data is NULL
 //                               or if fourcc corresponds to an image chunk.
@@ -217,7 +223,9 @@ struct WebPMuxFrameInfo {
 //   bitstream - (in) can be a raw VP8/VP8L bitstream or a single-image
 //               WebP file (non-animated)
 //   copy_data - (in) value 1 indicates given data WILL be copied to the mux
-//               object and value 0 indicates data will NOT be copied.
+//               object and value 0 indicates data will NOT be copied. If the
+//               data is not copied, it must exist until a call to
+//               WebPMuxAssemble() is made.
 // Returns:
 //   WEBP_MUX_INVALID_ARGUMENT - if mux is NULL or bitstream is NULL.
 //   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
@@ -235,7 +243,9 @@ WEBP_EXTERN WebPMuxError WebPMuxSetImage(
 //   mux - (in/out) object to which the frame is to be added
 //   frame - (in) frame data.
 //   copy_data - (in) value 1 indicates given data WILL be copied to the mux
-//               object and value 0 indicates data will NOT be copied.
+//               object and value 0 indicates data will NOT be copied. If the
+//               data is not copied, it must exist until a call to
+//               WebPMuxAssemble() is made.
 // Returns:
 //   WEBP_MUX_INVALID_ARGUMENT - if mux or frame is NULL
 //                               or if content of 'frame' is invalid.
@@ -449,7 +459,7 @@ WEBP_EXTERN int WebPAnimEncoderOptionsInitInternal(
 // structure before modification. Returns false in case of version mismatch.
 // WebPAnimEncoderOptionsInit() must have succeeded before using the
 // 'enc_options' object.
-static WEBP_INLINE int WebPAnimEncoderOptionsInit(
+WEBP_NODISCARD static WEBP_INLINE int WebPAnimEncoderOptionsInit(
     WebPAnimEncoderOptions* enc_options) {
   return WebPAnimEncoderOptionsInitInternal(enc_options, WEBP_MUX_ABI_VERSION);
 }
@@ -490,7 +500,7 @@ static WEBP_INLINE WebPAnimEncoder* WebPAnimEncoderNew(
 // Returns:
 //   On error, returns false and frame->error_code is set appropriately.
 //   Otherwise, returns true.
-WEBP_EXTERN int WebPAnimEncoderAdd(
+WEBP_NODISCARD WEBP_EXTERN int WebPAnimEncoderAdd(
     WebPAnimEncoder* enc, struct WebPPicture* frame, int timestamp_ms,
     const struct WebPConfig* config);
 
@@ -503,8 +513,8 @@ WEBP_EXTERN int WebPAnimEncoderAdd(
 //   webp_data - (out) generated WebP bitstream.
 // Returns:
 //   True on success.
-WEBP_EXTERN int WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
-                                        WebPData* webp_data);
+WEBP_NODISCARD WEBP_EXTERN int WebPAnimEncoderAssemble(WebPAnimEncoder* enc,
+                                                       WebPData* webp_data);
 
 // Get error string corresponding to the most recent call using 'enc'. The
 // returned string is owned by 'enc' and is valid only until the next call to
@@ -522,6 +532,57 @@ WEBP_EXTERN const char* WebPAnimEncoderGetError(WebPAnimEncoder* enc);
 WEBP_EXTERN void WebPAnimEncoderDelete(WebPAnimEncoder* enc);
 
 //------------------------------------------------------------------------------
+// Non-image chunks.
+
+// Note: Only non-image related chunks should be managed through chunk APIs.
+// (Image related chunks are: "ANMF", "VP8 ", "VP8L" and "ALPH").
+
+// Adds a chunk with id 'fourcc' and data 'chunk_data' in the enc object.
+// Any existing chunk(s) with the same id will be removed.
+// Parameters:
+//   enc - (in/out) object to which the chunk is to be added
+//   fourcc - (in) a character array containing the fourcc of the given chunk;
+//                 e.g., "ICCP", "XMP ", "EXIF", etc.
+//   chunk_data - (in) the chunk data to be added
+//   copy_data - (in) value 1 indicates given data WILL be copied to the enc
+//               object and value 0 indicates data will NOT be copied. If the
+//               data is not copied, it must exist until a call to
+//               WebPAnimEncoderAssemble() is made.
+// Returns:
+//   WEBP_MUX_INVALID_ARGUMENT - if enc, fourcc or chunk_data is NULL.
+//   WEBP_MUX_MEMORY_ERROR - on memory allocation error.
+//   WEBP_MUX_OK - on success.
+WEBP_EXTERN WebPMuxError WebPAnimEncoderSetChunk(
+    WebPAnimEncoder* enc, const char fourcc[4], const WebPData* chunk_data,
+    int copy_data);
+
+// Gets a reference to the data of the chunk with id 'fourcc' in the enc object.
+// The caller should NOT free the returned data.
+// Parameters:
+//   enc - (in) object from which the chunk data is to be fetched
+//   fourcc - (in) a character array containing the fourcc of the chunk;
+//                 e.g., "ICCP", "XMP ", "EXIF", etc.
+//   chunk_data - (out) returned chunk data
+// Returns:
+//   WEBP_MUX_INVALID_ARGUMENT - if enc, fourcc or chunk_data is NULL.
+//   WEBP_MUX_NOT_FOUND - If enc does not contain a chunk with the given id.
+//   WEBP_MUX_OK - on success.
+WEBP_EXTERN WebPMuxError WebPAnimEncoderGetChunk(
+    const WebPAnimEncoder* enc, const char fourcc[4], WebPData* chunk_data);
+
+// Deletes the chunk with the given 'fourcc' from the enc object.
+// Parameters:
+//   enc - (in/out) object from which the chunk is to be deleted
+//   fourcc - (in) a character array containing the fourcc of the chunk;
+//                 e.g., "ICCP", "XMP ", "EXIF", etc.
+// Returns:
+//   WEBP_MUX_INVALID_ARGUMENT - if enc or fourcc is NULL.
+//   WEBP_MUX_NOT_FOUND - If enc does not contain a chunk with the given fourcc.
+//   WEBP_MUX_OK - on success.
+WEBP_EXTERN WebPMuxError WebPAnimEncoderDeleteChunk(
+    WebPAnimEncoder* enc, const char fourcc[4]);
+
+//------------------------------------------------------------------------------
 
 #ifdef __cplusplus
 }    // extern "C"
diff --git a/media/libwebp/src/webp/mux_types.h b/media/libwebp/src/webp/mux_types.h
index 2fe8195839..c585d2082f 100644
--- a/media/libwebp/src/webp/mux_types.h
+++ b/media/libwebp/src/webp/mux_types.h
@@ -79,7 +79,8 @@ static WEBP_INLINE void WebPDataClear(WebPData* webp_data) {
 
 // Allocates necessary storage for 'dst' and copies the contents of 'src'.
 // Returns true on success.
-static WEBP_INLINE int WebPDataCopy(const WebPData* src, WebPData* dst) {
+WEBP_NODISCARD static WEBP_INLINE int WebPDataCopy(const WebPData* src,
+                                                   WebPData* dst) {
   if (src == NULL || dst == NULL) return 0;
   WebPDataInit(dst);
   if (src->bytes != NULL && src->size != 0) {
diff --git a/media/libwebp/src/webp/types.h b/media/libwebp/src/webp/types.h
index f255432e41..9c17edec45 100644
--- a/media/libwebp/src/webp/types.h
+++ b/media/libwebp/src/webp/types.h
@@ -36,18 +36,39 @@ typedef long long int int64_t;
 #define WEBP_INLINE __forceinline
 #endif  /* _MSC_VER */
 
+#ifndef WEBP_NODISCARD
+#if defined(WEBP_ENABLE_NODISCARD) && WEBP_ENABLE_NODISCARD
+#if (defined(__cplusplus) && __cplusplus >= 201700L) || \
+    (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
+#define WEBP_NODISCARD [[nodiscard]]
+#else
+// gcc's __has_attribute does not work for enums.
+#if defined(__clang__) && defined(__has_attribute)
+#if __has_attribute(warn_unused_result)
+#define WEBP_NODISCARD __attribute__((warn_unused_result))
+#else
+#define WEBP_NODISCARD
+#endif  /* __has_attribute(warn_unused_result) */
+#else
+#define WEBP_NODISCARD
+#endif  /* defined(__clang__) && defined(__has_attribute) */
+#endif  /* (defined(__cplusplus) && __cplusplus >= 201700L) ||
+           (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L) */
+#else
+#define WEBP_NODISCARD
+#endif  /* defined(WEBP_ENABLE_NODISCARD) && WEBP_ENABLE_NODISCARD */
+#endif  /* WEBP_NODISCARD */
+
 #ifndef WEBP_EXTERN
 // This explicitly marks library functions and allows for changing the
 // signature for e.g., Windows DLL builds.
-# if defined(__GNUC__) && __GNUC__ >= 4
+# if defined(_WIN32) && defined(WEBP_DLL)
+#  define WEBP_EXTERN __declspec(dllexport)
+# elif defined(__GNUC__) && __GNUC__ >= 4
 #  define WEBP_EXTERN extern __attribute__ ((visibility ("default")))
 # else
-#  if defined(_MSC_VER) && defined(WEBP_DLL)
-#   define WEBP_EXTERN __declspec(dllexport)
-#  else
-#   define WEBP_EXTERN extern
-#  endif
-# endif  /* __GNUC__ >= 4 */
+#  define WEBP_EXTERN extern
+# endif  /* defined(_WIN32) && defined(WEBP_DLL) */
 #endif  /* WEBP_EXTERN */
 
 // Macro to check ABI compatibility (same major revision number)
@@ -60,7 +81,7 @@ extern "C" {
 // Allocates 'size' bytes of memory. Returns NULL upon error. Memory
 // must be deallocated by calling WebPFree(). This function is made available
 // by the core 'libwebp' library.
-WEBP_EXTERN void* WebPMalloc(size_t size);
+WEBP_NODISCARD WEBP_EXTERN void* WebPMalloc(size_t size);
 
 // Releases memory returned by the WebPDecode*() functions (from decode.h).
 WEBP_EXTERN void WebPFree(void* ptr);