Plugin Power Saver: Mute throttled plugins.

ppapi/shared_impl/ppb_audio_shared.cc

Index: ppapi/shared_impl/ppb_audio_shared.cc
diff --git a/ppapi/shared_impl/ppb_audio_shared.cc b/ppapi/shared_impl/ppb_audio_shared.cc
index 99af9d7e7e20bfece9fd2f2870c13a1d2d2f13d9..05985e9d2ba4f889287b031af225f90a16913db1 100644
--- a/ppapi/shared_impl/ppb_audio_shared.cc
+++ b/ppapi/shared_impl/ppb_audio_shared.cc
@@ -50,7 +50,9 @@ void AudioCallbackCombined::Run(void* sample_buffer,
 
 PPB_Audio_Shared::PPB_Audio_Shared()
     : playing_(false),
+      muted_for_power_saver_(false),
       shared_memory_size_(0),
+      nacl_thread_id_(0),
       nacl_thread_active_(false),
       user_data_(NULL),
       client_buffer_size_bytes_(0),
@@ -197,6 +199,16 @@ void PPB_Audio_Shared::SetThreadFunctions(
   g_thread_functions = *functions;
 }
 
+void PPB_Audio_Shared::SetMutedForPowerSaver(bool muted_for_power_saver) {
+  base::AutoLock lock(mute_lock_);
+  muted_for_power_saver_ = muted_for_power_saver;
+}
+
+bool PPB_Audio_Shared::IsMutedForPowerSaver() {
+  base::AutoLock lock(mute_lock_);
+  return muted_for_power_saver_;
+}
+
 // static
 void PPB_Audio_Shared::CallRun(void* self) {
   PPB_Audio_Shared* audio = static_cast<PPB_Audio_Shared*>(self);
@@ -221,6 +233,10 @@ void PPB_Audio_Shared::Run() {
           client_buffer_.get(), client_buffer_size_bytes_, latency, user_data_);
     }
 
+    if (IsMutedForPowerSaver()) {

[tommycli, 2015/01/28 20:41:24]

This doesn't actually work!

As far as I can tell, there are actually two instances of PPB_Audio_Shared, and
the muted_for_power_saver_ variable is not shared between them.

Is the other one the "proxy" object that lives in a whole different process?

+      memset(client_buffer_.get(), 0, client_buffer_size_bytes_);
+    }
+
     // Deinterleave the audio data into the shared memory as floats.
     audio_bus_->FromInterleaved(client_buffer_.get(),
                                 audio_bus_->frames(),