Enable platform echo cancellation through the AudioRecord path.

content/common/media/media_stream_options.h

Index: content/common/media/media_stream_options.h
diff --git a/content/common/media/media_stream_options.h b/content/common/media/media_stream_options.h
index e48aed1203992a6e9d2922cfa24bd60654a62f46..8087a059e577fe0767f1ed4b0bc99b49e8e5c2bd 100644
--- a/content/common/media/media_stream_options.h
+++ b/content/common/media/media_stream_options.h
@@ -57,7 +57,8 @@ struct CONTENT_EXPORT StreamDeviceInfo {
                    const std::string& device_param,
                    int sample_rate,
                    int channel_layout,
-                   int frames_per_buffer);
+                   int frames_per_buffer,
+                   bool use_platform_aec);
   static bool IsEqual(const StreamDeviceInfo& first,
                       const StreamDeviceInfo& second);