Adding functionality for activating for the WebRTC EchoCanceller3 functionality in Chrome.

content/public/common/content_features.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "build/build_config.h"
 #include "content/public/common/content_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
@@ skipping 242 matching lines @@
 
 // Use GpuMemoryBuffer backed VideoFrames in media streams.
 const base::Feature kWebRtcUseGpuMemoryBufferVideoFrames{
     "WebRTC-UseGpuMemoryBufferVideoFrames",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Enables HW H264 encoding on Android.
 const base::Feature kWebRtcHWH264Encoding{
     "WebRtcHWH264Encoding", base::FEATURE_ENABLED_BY_DEFAULT};
 
+// Enables the WebRTC Echo Canceller version 3 (AEC3). Feature for
+// http://crbug.com/688388. This value is sent to WebRTC's echo canceller to
+// toggle which echo canceller should be used.
+const base::Feature kWebRtcUseEchoCanceller3{"WebRtcUseEchoCanceller3",
+                                             base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Controls whether the WebUSB API is enabled:
 // https://wicg.github.io/webusb
 const base::Feature kWebUsb{"WebUSB", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Make sendBeacon throw for a Blob with a non simple type.
 const base::Feature kSendBeaconThrowForBlobWithNonSimpleType{
     "SendBeaconThrowForBlobWithNonSimpleType",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
 #if defined(OS_ANDROID)
@@ skipping 22 matching lines @@
 #endif  // !defined(OS_ANDROID)
 
 #if defined(OS_WIN)
 // Emergency "off switch" for new Windows sandbox security mitigation,
 // sandbox::MITIGATION_EXTENSION_POINT_DISABLE.
 const base::Feature kWinSboxDisableExtensionPoints{
     "WinSboxDisableExtensionPoint", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 }  // namespace features