[Media Router] Add UMA metrics for Media Router Dialog WebUI performance.

chrome/browser/media/router/media_router_metrics.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/router/media_router_metrics.h"
 
 #include "base/metrics/histogram_macros.h"
 
 namespace media_router {
 
 // static
 void MediaRouterMetrics::RecordMediaRouterDialogOrigin(
     MediaRouterDialogOpenOrigin origin) {
   DCHECK(origin != MediaRouterDialogOpenOrigin::TOTAL_COUNT);
   UMA_HISTOGRAM_ENUMERATION(
       "MediaRouter.Icon.Click.Location", static_cast<int>(origin),
       static_cast<int>(MediaRouterDialogOpenOrigin::TOTAL_COUNT));
 }
 
 // static
 void MediaRouterMetrics::RecordMediaRouteProviderWakeReason(
     MediaRouteProviderWakeReason reason) {
   DCHECK(reason != MediaRouteProviderWakeReason::TOTAL_COUNT);
   UMA_HISTOGRAM_ENUMERATION(
       "MediaRouter.Provider.WakeReason", static_cast<int>(reason),
       static_cast<int>(MediaRouteProviderWakeReason::TOTAL_COUNT));
 }
 
+// static
+void MediaRouterMetrics::RecordMediaRouterDialogPaint(
+    const base::TimeDelta delta) {
+  UMA_HISTOGRAM_TIMES("MediaRouter.Ui.Dialog.Paint",
+                      delta);
+}
+
+// static
+void MediaRouterMetrics::RecordMediaRouterDialogLoaded(
+    const base::TimeDelta delta) {
+  UMA_HISTOGRAM_TIMES("MediaRouter.Ui.Dialog.LoadedWithData",
+                      delta);
+}
+
 }  // namespace media_router