Plugin Power Saver: Add some UMAs to test plugins in wild.

content/renderer/pepper/pepper_plugin_instance_impl.h

Index: content/renderer/pepper/pepper_plugin_instance_impl.h
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.h b/content/renderer/pepper/pepper_plugin_instance_impl.h
index 5389a8be4a323b4c32c8581f978d5751e6522aa6..9f55084609a3c09e9bd890eb4ae62f10588eb5be 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.h
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.h
@@ -688,7 +688,7 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
                                  const ppapi::URLResponseInfoData& data);
 
   void SetPluginThrottled(bool throttled);
-  void DisablePowerSaverAndUnthrottle();
+  void DisablePowerSaverByRetroactiveWhitelist();
 
   RenderFrameImpl* render_frame_;
   base::Closure instance_deleted_callback_;
@@ -714,8 +714,14 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   GURL plugin_url_;
 
   // Indicates whether this plugin may be throttled to reduce power consumption.
+  // |power_saver_enabled_| implies |is_peripheral_content_|.
   bool power_saver_enabled_;
 
+  // Indicates whether this plugin was found to be peripheral content.
+  // This is separately tracked from |power_saver_enabled_| to collect UMAs.
+  // Always true if |power_saver_enabled_| is true.
+  bool is_peripheral_content_;
+
   // Indicates if the plugin is currently throttled.
   bool plugin_throttled_;