Plugin Power Saver: Mute throttled plugins.

content/public/renderer/plugin_instance_throttler.h

Index: content/public/renderer/plugin_instance_throttler.h
diff --git a/content/public/renderer/plugin_instance_throttler.h b/content/public/renderer/plugin_instance_throttler.h
index d20f5257cd5c79f224701f5692658979c026dd25..f9c5b92a2cce71e7ff50c1752aa21d9324c04089 100644
--- a/content/public/renderer/plugin_instance_throttler.h
+++ b/content/public/renderer/plugin_instance_throttler.h
@@ -84,6 +84,10 @@ class CONTENT_EXPORT PluginInstanceThrottler {
 
   virtual blink::WebPlugin* GetWebPlugin() const = 0;
 
+  // Throttler needs to know when the plugin audio is throttled, as this may
+  // prevent the plugin from generating new frames.
+  virtual void NotifyAudioThrottled() = 0;
+
  protected:
   PluginInstanceThrottler() {}