Add UMA metrics for blocked plugins.

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 759388adf7a80b9607e5a0df5390d40610a7b2bb..c2adebd639005e3f271758f215649ad0f93ab808 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -461,10 +461,14 @@ WebPlugin* ChromeContentRendererClient::CreatePluginImpl(
 
   observer->DidBlockContentType(CONTENT_SETTINGS_TYPE_PLUGINS, resource);
   if (plugin_setting == CONTENT_SETTING_ASK) {
+    render_view->Send(
+        new ViewHostMsg_UserMetricsRecordAction("Plugin_ClickToPlay"));
     return CreatePluginPlaceholder(
         render_view, frame, params, *group, IDR_CLICK_TO_PLAY_PLUGIN_HTML,
         IDS_PLUGIN_LOAD, false, true);
   } else {
+    render_view->Send(
+        new ViewHostMsg_UserMetricsRecordAction("Plugin_Blocked"));
     return CreatePluginPlaceholder(
         render_view, frame, params, *group, IDR_BLOCKED_PLUGIN_HTML,
         IDS_PLUGIN_BLOCKED, false, true);