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diff --git a/image/decoders/nsWebPDecoder.h b/image/decoders/nsWebPDecoder.h
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+++ b/image/decoders/nsWebPDecoder.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_image_decoders_nsWebPDecoder_h
+#define mozilla_image_decoders_nsWebPDecoder_h
+
+#include "Decoder.h"
+#include "webp/demux.h"
+#include "StreamingLexer.h"
+#include "SurfacePipe.h"
+
+namespace mozilla {
+namespace image {
+class RasterImage;
+
+class nsWebPDecoder final : public Decoder {
+ public:
+  virtual ~nsWebPDecoder();
+
+  DecoderType GetType() const override { return DecoderType::WEBP; }
+
+ protected:
+  LexerResult DoDecode(SourceBufferIterator& aIterator,
+                       IResumable* aOnResume) override;
+  Maybe<Telemetry::HistogramID> SpeedHistogram() const override;
+
+ private:
+  friend class DecoderFactory;
+
+  // Decoders should only be instantiated via DecoderFactory.
+  explicit nsWebPDecoder(RasterImage* aImage);
+
+  void ApplyColorProfile(const char* aProfile, size_t aLength);
+
+  LexerResult UpdateBuffer(SourceBufferIterator& aIterator,
+                           SourceBufferIterator::State aState);
+  LexerResult ReadData();
+  LexerResult ReadHeader(WebPDemuxer* aDemuxer, bool aIsComplete);
+  LexerResult ReadPayload(WebPDemuxer* aDemuxer, bool aIsComplete);
+
+  nsresult CreateFrame(const OrientedIntRect& aFrameRect);
+  void EndFrame();
+
+  LexerResult ReadSingle(const uint8_t* aData, size_t aLength,
+                         const OrientedIntRect& aFrameRect);
+
+  LexerResult ReadMultiple(WebPDemuxer* aDemuxer, bool aIsComplete);
+
+  /// The SurfacePipe used to write to the output surface.
+  SurfacePipe mPipe;
+
+  /// The buffer used to accumulate data until the complete WebP header is
+  /// received, if and only if the iterator is discontiguous.
+  Vector<uint8_t> mBufferedData;
+
+  /// The libwebp output buffer descriptor pointing to the decoded data.
+  WebPDecBuffer mBuffer;
+
+  /// The libwebp incremental decoder descriptor, wraps mBuffer.
+  WebPIDecoder* mDecoder;
+
+  /// Blend method for the current frame.
+  BlendMethod mBlend;
+
+  /// Disposal method for the current frame.
+  DisposalMethod mDisposal;
+
+  /// Frame timeout for the current frame;
+  FrameTimeout mTimeout;
+
+  /// Surface format for the current frame.
+  gfx::SurfaceFormat mFormat;
+
+  /// Frame rect for the current frame.
+  OrientedIntRect mFrameRect;
+
+  /// The last row of decoded pixels written to mPipe.
+  int mLastRow;
+
+  /// Number of decoded frames.
+  uint32_t mCurrentFrame;
+
+  /// Pointer to the start of the contiguous encoded image data.
+  const uint8_t* mData;
+
+  /// Length of data pointed to by mData.
+  size_t mLength;
+
+  /// True if the iterator has reached its end.
+  bool mIteratorComplete;
+
+  /// True if this decoding pass requires a WebPDemuxer.
+  bool mNeedDemuxer;
+
+  /// True if we have setup the color profile for the image.
+  bool mGotColorProfile;
+};
+
+}  // namespace image
+}  // namespace mozilla
+
+#endif  // mozilla_image_decoders_nsWebPDecoder_h