Expose flash playback status and volume control to content renderer

content/renderer/pepper/pepper_platform_audio_output.cc

Index: content/renderer/pepper/pepper_platform_audio_output.cc
diff --git a/content/renderer/pepper/pepper_platform_audio_output.cc b/content/renderer/pepper/pepper_platform_audio_output.cc
index 1e9c74cc7e5700c486041d4598e5f707201dbd86..a8e7c4336689621fba646a8685ae800025a10573 100644
--- a/content/renderer/pepper/pepper_platform_audio_output.cc
+++ b/content/renderer/pepper/pepper_platform_audio_output.cc
@@ -60,6 +60,17 @@ bool PepperPlatformAudioOutput::StopPlayback() {
   return false;
 }
 
+bool PepperPlatformAudioOutput::SetVolume(double volume) {
+  if (ipc_) {

[mlamouri (slow - plz ping), 2016/06/23 13:04:13]

I would prefer `if (!ipc_) return false;` (ie. early return) but I understand it
doesn't match the style of the file and that's sad :)

[Zhiqiang Zhang (Slow), 2016/06/23 14:50:29]

Acknowledged.

+    io_task_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(&PepperPlatformAudioOutput::SetVolumeOnIOThread,
+                   this, volume));
+    return true;
+  }
+  return false;
+}
+
 void PepperPlatformAudioOutput::ShutDown() {
   // Called on the main thread to stop all audio callbacks. We must only change
   // the client on the main thread, and the delegates from the I/O thread.
@@ -156,6 +167,12 @@ void PepperPlatformAudioOutput::StartPlaybackOnIOThread() {
     ipc_->PlayStream();
 }
 
+void PepperPlatformAudioOutput::SetVolumeOnIOThread(double volume) {
+  DCHECK(io_task_runner_->BelongsToCurrentThread());
+  if (ipc_)
+    ipc_->SetVolume(volume);
+}
+
 void PepperPlatformAudioOutput::StopPlaybackOnIOThread() {
   DCHECK(io_task_runner_->BelongsToCurrentThread());
   if (ipc_)