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diff --git a/third_party/libwebrtc/webrtc/modules/audio_processing/debug.proto b/third_party/libwebrtc/webrtc/modules/audio_processing/debug.proto
new file mode 100644
index 0000000000..44177735e8
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+++ b/third_party/libwebrtc/webrtc/modules/audio_processing/debug.proto
@@ -0,0 +1,94 @@
+syntax = "proto2";
+option optimize_for = LITE_RUNTIME;
+package webrtc.audioproc;
+
+// Contains the format of input/output/reverse audio. An Init message is added
+// when any of the fields are changed.
+message Init {
+  optional int32 sample_rate = 1;
+  optional int32 device_sample_rate = 2 [deprecated=true];
+  optional int32 num_input_channels = 3;
+  optional int32 num_output_channels = 4;
+  optional int32 num_reverse_channels = 5;
+  optional int32 reverse_sample_rate = 6;
+  optional int32 output_sample_rate = 7;
+  optional int32 reverse_output_sample_rate = 8;
+  optional int32 num_reverse_output_channels = 9;
+}
+
+// May contain interleaved or deinterleaved data, but don't store both formats.
+message ReverseStream {
+  // int16 interleaved data.
+  optional bytes data = 1;
+
+  // float deinterleaved data, where each repeated element points to a single
+  // channel buffer of data.
+  repeated bytes channel = 2;
+}
+
+// May contain interleaved or deinterleaved data, but don't store both formats.
+message Stream {
+  // int16 interleaved data.
+  optional bytes input_data = 1;
+  optional bytes output_data = 2;
+
+  optional int32 delay = 3;
+  optional sint32 drift = 4;
+  optional int32 level = 5;
+  optional bool keypress = 6;
+
+  // float deinterleaved data, where each repeated element points to a single
+  // channel buffer of data.
+  repeated bytes input_channel = 7;
+  repeated bytes output_channel = 8;
+}
+
+// Contains the configurations of various APM component. A Config message is
+// added when any of the fields are changed.
+message Config {
+  // Next field number 19.
+  // Acoustic echo canceler.
+  optional bool aec_enabled = 1;
+  optional bool aec_delay_agnostic_enabled = 2;
+  optional bool aec_drift_compensation_enabled = 3;
+  optional bool aec_extended_filter_enabled = 4;
+  optional int32 aec_suppression_level = 5;
+  // Mobile AEC.
+  optional bool aecm_enabled = 6;
+  optional bool aecm_comfort_noise_enabled = 7;
+  optional int32 aecm_routing_mode = 8;
+  // Automatic gain controller.
+  optional bool agc_enabled = 9;
+  optional int32 agc_mode = 10;
+  optional bool agc_limiter_enabled = 11;
+  optional bool noise_robust_agc_enabled = 12;
+  // High pass filter.
+  optional bool hpf_enabled = 13;
+  // Noise suppression.
+  optional bool ns_enabled = 14;
+  optional int32 ns_level = 15;
+  // Transient suppression.
+  optional bool transient_suppression_enabled = 16;
+  // Semicolon-separated string containing experimental feature
+  // descriptions.
+  optional string experiments_description = 17;
+  // Intelligibility Enhancer
+  optional bool intelligibility_enhancer_enabled = 18;
+}
+
+message Event {
+  enum Type {
+    INIT = 0;
+    REVERSE_STREAM = 1;
+    STREAM = 2;
+    CONFIG = 3;
+    UNKNOWN_EVENT = 4;
+  }
+
+  required Type type = 1;
+
+  optional Init init = 2;
+  optional ReverseStream reverse_stream = 3;
+  optional Stream stream = 4;
+  optional Config config = 5;
+}