Plugin Power Saver: Fix Flash JS usage UMA.

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 1f21842a6d66d3153e40e7fd2ee1610ab1d9e87c..3a0a69aeb3089905e461922c7d7883ceb8712095 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.h
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.h
@@ -719,10 +719,10 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
   bool layer_is_hardware_;
 
   // Plugin URL.
-  GURL plugin_url_;
+  const GURL plugin_url_;
 
   // Used to track Flash-specific metrics.
-  bool is_flash_plugin_;
+  const bool is_flash_plugin_;
 
   // Set to true the first time the plugin is clicked. Used to collect metrics.
   bool has_been_clicked_;
@@ -924,6 +924,8 @@ class CONTENT_EXPORT PepperPluginInstanceImpl
 
   bool is_tracking_latency_;
 
+  bool initialized_;
+
   // We use a weak ptr factory for scheduling DidChangeView events so that we
   // can tell whether updates are pending and consolidate them. When there's
   // already a weak ptr pending (HasWeakPtrs is true), code should update the