[Media Router] Add UMA metrics to record the load time for route controls

chrome/browser/ui/webui/media_router/media_router_webui_message_handler.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_webui_message_handler.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
@@ skipping 42 matching lines @@
 const char kReportFilter[] = "reportFilter";
 const char kReportInitialAction[] = "reportInitialAction";
 const char kReportInitialState[] = "reportInitialState";
 const char kReportNavigateToView[] = "reportNavigateToView";
 const char kReportRouteCreationOutcome[] = "reportRouteCreationOutcome";
 const char kReportRouteCreation[] = "reportRouteCreation";
 const char kReportSelectedCastMode[] = "reportSelectedCastMode";
 const char kReportSinkCount[] = "reportSinkCount";
 const char kReportTimeToClickSink[] = "reportTimeToClickSink";
 const char kReportTimeToInitialActionClose[] = "reportTimeToInitialActionClose";
+const char kReportWebUIRouteControllerLoaded[] =
+    "reportWebUIRouteControllerLoaded";
 const char kSearchSinksAndCreateRoute[] = "searchSinksAndCreateRoute";
 const char kOnInitialDataReceived[] = "onInitialDataReceived";
 const char kOnMediaControllerAvailable[] = "onMediaControllerAvailable";
 const char kOnMediaControllerClosed[] = "onMediaControllerClosed";
 const char kPauseCurrentMedia[] = "pauseCurrentMedia";
 const char kPlayCurrentMedia[] = "playCurrentMedia";
 const char kSeekCurrentMedia[] = "seekCurrentMedia";
 const char kSetCurrentMediaMute[] = "setCurrentMediaMute";
 const char kSetCurrentMediaVolume[] = "setCurrentMediaVolume";
 
@@ skipping 351 matching lines @@
   web_ui()->RegisterMessageCallback(
       kReportTimeToClickSink,
       base::Bind(&MediaRouterWebUIMessageHandler::OnReportTimeToClickSink,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       kReportTimeToInitialActionClose,
       base::Bind(
           &MediaRouterWebUIMessageHandler::OnReportTimeToInitialActionClose,
           base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
+      kReportWebUIRouteControllerLoaded,
+      base::Bind(
+          &MediaRouterWebUIMessageHandler::OnReportWebUIRouteControllerLoaded,
+          base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
       kSearchSinksAndCreateRoute,
       base::Bind(&MediaRouterWebUIMessageHandler::OnSearchSinksAndCreateRoute,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       kOnInitialDataReceived,
       base::Bind(&MediaRouterWebUIMessageHandler::OnInitialDataReceived,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       kOnMediaControllerAvailable,
       base::Bind(&MediaRouterWebUIMessageHandler::OnMediaControllerAvailable,
@@ skipping 357 matching lines @@
   DVLOG(1) << "OnReportTimeToClickSink";
   double time_to_click;
   if (!args->GetDouble(0, &time_to_click)) {
     DVLOG(1) << "Unable to extract args.";
     return;
   }
   UMA_HISTOGRAM_TIMES("MediaRouter.Ui.Action.StartLocal.Latency",
                       base::TimeDelta::FromMillisecondsD(time_to_click));
 }
 
+void MediaRouterWebUIMessageHandler::OnReportWebUIRouteControllerLoaded(
+    const base::ListValue* args) {
+  DVLOG(1) << "OnReportWebUIRouteControllerLoaded";
+  double load_time;
+  if (!args->GetDouble(0, &load_time)) {
+    DVLOG(1) << "Unable to extract args.";
+    return;
+  }
+  UMA_HISTOGRAM_TIMES("MediaRouter.Ui.Dialog.LoadedWebUiRouteController",
+                      base::TimeDelta::FromMillisecondsD(load_time));
+}
+
 void MediaRouterWebUIMessageHandler::OnReportTimeToInitialActionClose(
     const base::ListValue* args) {
   DVLOG(1) << "OnReportTimeToInitialActionClose";
   double time_to_close;
   if (!args->GetDouble(0, &time_to_close)) {
     VLOG(0) << "Unable to extract args.";
     return;
   }
   UMA_HISTOGRAM_TIMES("MediaRouter.Ui.Action.CloseLatency",
                       base::TimeDelta::FromMillisecondsD(time_to_close));
@@ skipping 227 matching lines @@
   }
 
   return value;
 }
 
 void MediaRouterWebUIMessageHandler::SetWebUIForTest(content::WebUI* web_ui) {
   set_web_ui(web_ui);
 }
 
 }  // namespace media_router