Plugin Power Saver: Mute throttled plugins.

content/renderer/pepper/ppb_audio_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_RENDERER_PEPPER_PPB_AUDIO_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PPB_AUDIO_IMPL_H_
 
 #include "base/basictypes.h"
 #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"
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/shared_impl/ppb_audio_config_shared.h"
 #include "ppapi/shared_impl/ppb_audio_shared.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/shared_impl/scoped_pp_resource.h"
 
 namespace content {
 class PepperPlatformAudioOutput;
 
 // Some of the backend functionality of this class is implemented by the
 // PPB_Audio_Shared so it can be shared with the proxy.
 //
 // TODO(teravest): PPB_Audio is no longer supported in-process. Clean this up
 // 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);
 
   // Resource overrides.
   ppapi::thunk::PPB_Audio_API* AsPPB_Audio_API() override;
 
   // PPB_Audio_API implementation.
   PP_Resource GetCurrentConfig() override;
   PP_Bool StartPlayback() override;
   PP_Bool StopPlayback() override;
   int32_t Open(PP_Resource config_id,
                scoped_refptr<ppapi::TrackedCallback> create_callback) override;
   int32_t GetSyncSocket(int* sync_socket) override;
   int32_t GetSharedMemory(int* shm_handle, uint32_t* shm_size) override;
 
  private:
   ~PPB_Audio_Impl() override;
 
   // AudioHelper implementation.
   void OnSetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
                        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_;
 
   // PluginDelegate audio object that we delegate audio IPC through. We don't
   // 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);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PPB_AUDIO_IMPL_H_