Enable platform echo cancellation through the AudioRecord path.

content/common/media/media_param_traits.cc

Index: content/common/media/media_param_traits.cc
diff --git a/content/common/media/media_param_traits.cc b/content/common/media/media_param_traits.cc
index f6eaec1a85ffccb0eda2a822bb6ab2921d6c417f..e47a49dbbfc831d3ee2fa8aadfee0553be8f15f2 100644
--- a/content/common/media/media_param_traits.cc
+++ b/content/common/media/media_param_traits.cc
@@ -25,6 +25,7 @@ void ParamTraits<AudioParameters>::Write(Message* m,
   m->WriteInt(p.frames_per_buffer());
   m->WriteInt(p.channels());
   m->WriteInt(p.input_channels());
+  m->WriteBool(p.effects().echo_canceller);
 }
 
 bool ParamTraits<AudioParameters>::Read(const Message* m,
@@ -32,6 +33,7 @@ bool ParamTraits<AudioParameters>::Read(const Message* m,
                                         AudioParameters* r) {
   int format, channel_layout, sample_rate, bits_per_sample,
       frames_per_buffer, channels, input_channels;
+  AudioParameters::PlatformEffects effects;
 
   if (!m->ReadInt(iter, &format) ||
       !m->ReadInt(iter, &channel_layout) ||
@@ -39,11 +41,13 @@ bool ParamTraits<AudioParameters>::Read(const Message* m,
       !m->ReadInt(iter, &bits_per_sample) ||
       !m->ReadInt(iter, &frames_per_buffer) ||
       !m->ReadInt(iter, &channels) ||
-      !m->ReadInt(iter, &input_channels))
+      !m->ReadInt(iter, &input_channels) ||
+      !m->ReadBool(iter, &effects.echo_canceller))
     return false;
   r->Reset(static_cast<AudioParameters::Format>(format),
            static_cast<ChannelLayout>(channel_layout), channels,
            input_channels, sample_rate, bits_per_sample, frames_per_buffer);
+  r->SetPlatformEffects(effects);
   if (!r->IsValid())
     return false;
   return true;