Add metrics for YouTube Flash embed rewrite.

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index 2c08a4d2e4c1bee3a4c2a9f5077a84d74aef1f50..b33690d457c70755d63047ed44358c2fb8d49734 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -74,6 +74,15 @@ class WebSecurityOrigin;
 class WebRtcLoggingMessageFilter;
 #endif
 
+// Used for UMA. Values should not be reorderer or reused.
+enum YouTubeRewriteStatus {
+  SUCCESS = 0,
+  SUCCESS_PARAMS_REWRITE = 1,
+  SUCCESS_ENABLEJSAPI = 2,
+  FAILURE_ENABLEJSAPI = 3,
+  NUM_PLUGIN_ERROR  // should be kept last
+};
+
 class ChromeContentRendererClient : public content::ContentRendererClient {
  public:
   ChromeContentRendererClient();
@@ -162,7 +171,6 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
       int embedded_worker_id,
       const GURL& url) override;
   bool ShouldEnforceWebRTCRoutingPreferences() override;
-
   GURL OverrideFlashEmbedWithHTML(const GURL& url) override;
 
 #if defined(ENABLE_SPELLCHECK)