Plugin Power Saver: Mute throttled plugins.

content/renderer/pepper/ppb_audio_impl.h

Index: content/renderer/pepper/ppb_audio_impl.h
diff --git a/content/renderer/pepper/ppb_audio_impl.h b/content/renderer/pepper/ppb_audio_impl.h
index 3348527028e7e327418c3bf2ed306adb3bd4cf3d..6c0af8f90fbf3222f73c5e188463e6a600ec270b 100644
--- a/content/renderer/pepper/ppb_audio_impl.h
+++ b/content/renderer/pepper/ppb_audio_impl.h
@@ -9,6 +9,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
+#include "content/public/renderer/plugin_instance_throttler.h"
 #include "content/renderer/pepper/audio_helper.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/ppb_audio.h"
@@ -28,7 +29,8 @@ class PepperPlatformAudioOutput;
 // to look more like typical HostResource implementations.
 class PPB_Audio_Impl : public ppapi::Resource,
                        public ppapi::PPB_Audio_Shared,
-                       public AudioHelper {
+                       public AudioHelper,
+                       public PluginInstanceThrottler::Observer {
  public:
   explicit PPB_Audio_Impl(PP_Instance instance);
 
@@ -52,6 +54,12 @@ class PPB_Audio_Impl : public ppapi::Resource,
                        size_t shared_memory_size_,
                        base::SyncSocket::Handle socket) override;
 
+  // PluginInstanceThrottler::Observer implementation.
+  void OnThrottleStateChange() override;
+
+  // Starts the deferred playback and unsubscribes from the throttler.
+  void StartDeferredPlayback();
+
   // AudioConfig used for creating this Audio object. We own a ref.
   ppapi::ScopedPPResource config_;
 
@@ -59,6 +67,9 @@ class PPB_Audio_Impl : public ppapi::Resource,
   // own this pointer but are responsible for calling Shutdown on it.
   PepperPlatformAudioOutput* audio_;
 
+  // Stream is playing, but throttled due to Plugin Power Saver.
+  bool playback_throttled_;
+
   DISALLOW_COPY_AND_ASSIGN(PPB_Audio_Impl);
 };