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

chrome/browser/ui/webui/media_router/media_router_ui.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/ui/webui/media_router/media_router_ui.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/guid.h"
 #include "base/i18n/string_compare.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/media/router/create_presentation_connection_request.h"
 #include "chrome/browser/media/router/issue.h"
 #include "chrome/browser/media/router/issues_observer.h"
 #include "chrome/browser/media/router/media_route.h"
 #include "chrome/browser/media/router/media_router.h"
 #include "chrome/browser/media/router/media_router_factory.h"
+#include "chrome/browser/media/router/media_router_metrics.h"
 #include "chrome/browser/media/router/media_router_mojo_impl.h"
 #include "chrome/browser/media/router/media_routes_observer.h"
 #include "chrome/browser/media/router/media_sink.h"
 #include "chrome/browser/media/router/media_sinks_observer.h"
 #include "chrome/browser/media/router/media_source.h"
 #include "chrome/browser/media/router/media_source_helper.h"
 #include "chrome/browser/media/router/presentation_service_delegate_impl.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/ui/webui/media_router/media_router_localized_strings_provider.h"
@@ skipping 442 matching lines @@
   return gurl.SchemeIs(extensions::kExtensionScheme)
              ? GetExtensionName(gurl, extensions::ExtensionRegistry::Get(
                                           Profile::FromWebUI(web_ui())))
              : TruncateHost(GetHostFromURL(gurl));
 }
 
 const std::string& MediaRouterUI::GetRouteProviderExtensionId() const {
   return router_->media_route_provider_extension_id();
 }
 
+void MediaRouterUI::SetUIInitializationTimer(const base::Time& start_time) {
+  DCHECK(!start_time.is_null());
+  start_time_ = start_time;
+}
+
+void MediaRouterUI::OnUIInitiallyLoaded() {
+  if (!start_time_.is_null()) {
+    MediaRouterMetrics::RecordMediaRouterDialogPaint(
+        base::Time::Now() - start_time_);
+  }
+}
+
+void MediaRouterUI::OnUIInitialDataReceived() {
+  if (!start_time_.is_null()) {
+    MediaRouterMetrics::RecordMediaRouterDialogLoaded(
+        base::Time::Now() - start_time_);
+    start_time_ = base::Time();
+  }
+}
+
 }  // namespace media_router