Add P2 UMA metrics for Media Router navigations.

This change adds the following metrics:
- Count of times the help page is opened.
- Count of times the user explicitly navigates from the route details to sink list.
- Count of times the user explicitly navigates from the sink list to route details.
- Count of times the user explicitly navigates from the sink list to cast mode picker.

BUG=547977

Review URL: https://codereview.chromium.org/1548123002

Cr-Commit-Position: refs/heads/master@{#367203}

chrome/browser/resources/media_router/elements/media_router_container/media_router_container.js

@@ -821,6 +821,7 @@ Polymer({
     var route = this.sinkToRouteMap_[sink.id];
     if (route) {
       this.showRouteDetails_(route);
+      this.fire('navigate-sink-list-to-details');
     } else if (this.currentLaunchingSinkId_ == '') {
       // Allow one launch at a time.
       this.fire('create-route', {
@@ -877,9 +878,11 @@ Polymer({
    * @private
    */
   toggleCastModeHidden_: function() {
-    if (this.currentView_ == media_router.MediaRouterView.CAST_MODE_LIST)
+    if (this.currentView_ == media_router.MediaRouterView.CAST_MODE_LIST) {
       this.showSinkList_();
-    else
+    } else {
       this.showCastModeList_();
+      this.fire('navigate-to-cast-mode-list');
+    }
   },
 });

chrome/browser/resources/media_router/media_router.js

@@ -22,12 +22,17 @@ cr.define('media_router', function() {
     container = $('media-router-container');
     media_router.ui.setContainer(container);
 
+    container.addEventListener('back-click', onNavigateToSinkList);
     container.addEventListener('cast-mode-selected', onCastModeSelected);
     container.addEventListener('close-button-click', onCloseDialogEvent);
     container.addEventListener('close-dialog', onCloseDialogEvent);
     container.addEventListener('close-route-click', onCloseRouteClick);
     container.addEventListener('create-route', onCreateRoute);
     container.addEventListener('issue-action-click', onIssueActionClick);
+    container.addEventListener('navigate-sink-list-to-details',
+                               onNavigateToDetails);
+    container.addEventListener('navigate-to-cast-mode-list',
+                               onNavigateToCastMode);
     container.addEventListener('report-sink-count', onSinkCountReported);
     container.addEventListener('sink-click', onSinkClick);
   }
@@ -108,6 +113,36 @@ cr.define('media_router', function() {
     media_router.browserApi.reportClickedSinkIndex(data.detail.index);
   }
 
+  /**
+   * Reports the user navigation to the cast mode view.
+   * Called when the user clicks the drop arrow to navigate to the cast mode
+   * view on the dialog.
+   */
+  function onNavigateToCastMode() {
+    media_router.browserApi.reportNavigateToView(
+        media_router.MediaRouterView.CAST_MODE_LIST);
+  }
+
+  /**
+   * Reports the user navigation the route details view.
+   * Called when the user clicks on a sink to navigate to the route details
+   * view.
+   */
+  function onNavigateToDetails() {
+    media_router.browserApi.reportNavigateToView(
+        media_router.MediaRouterView.ROUTE_DETAILS);
+  }
+
+  /**
+   * Reports the user navigation the sink list view.
+   * Called when the user clicks on the back button from the route details view
+   * to the sink list view.
+   */
+  function onNavigateToSinkList() {
+    media_router.browserApi.reportNavigateToView(
+        media_router.MediaRouterView.SINK_LIST);
+  }
+
   /**
    * Reports the current sink count.
    * Called 3 seconds after the dialog is initially opened.

chrome/browser/resources/media_router/media_router_ui_interface.js

@@ -157,6 +157,15 @@ cr.define('media_router.browserApi', function() {
     chrome.send('reportClickedSinkIndex', [sinkIndex]);
   }
 
+  /**
+   * Reports the navigation to the specified view.
+   *
+   * @param {string} view
+   */
+  function reportNavigateToView(view) {
+    chrome.send('reportNavigateToView', [view]);
+  }
+
   /**
    * Reports the cast mode that the user selected.
    *
@@ -201,6 +210,7 @@ cr.define('media_router.browserApi', function() {
     closeRoute: closeRoute,
     onInitialDataReceived: onInitialDataReceived,
     reportClickedSinkIndex: reportClickedSinkIndex,
+    reportNavigateToView: reportNavigateToView,
     reportSelectedCastMode: reportSelectedCastMode,
     reportSinkCount: reportSinkCount,
     requestInitialData: requestInitialData,

chrome/browser/ui/toolbar/media_router_contextual_menu.cc

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/logging.h"
+#include "base/metrics/user_metrics.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/media/router/media_router_factory.h"
 #include "chrome/browser/media/router/media_router_mojo_impl.h"
@@ -86,6 +87,8 @@ void MediaRouterContextualMenu::ExecuteCommand(int command_id,
       break;
     case IDC_MEDIA_ROUTER_HELP:
       chrome::ShowSingletonTab(browser_, GURL(kCastHelpCenterPageUrl));
+      base::RecordAction(base::UserMetricsAction(
+          "MediaRouter_Ui_Navigate_Help"));
       break;
     case IDC_MEDIA_ROUTER_LEARN_MORE:
       chrome::ShowSingletonTab(browser_, GURL(kCastLearnMorePageUrl));

chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc

@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
+#include "base/metrics/user_metrics.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/media/router/issue.h"
 #include "chrome/browser/ui/webui/media_router/media_router_ui.h"
@@ -30,6 +31,7 @@ const char kActOnIssue[] = "actOnIssue";
 const char kCloseRoute[] = "closeRoute";
 const char kCloseDialog[] = "closeDialog";
 const char kReportClickedSinkIndex[] = "reportClickedSinkIndex";
+const char kReportNavigateToView[] = "reportNavigateToView";
 const char kReportSelectedCastMode[] = "reportSelectedCastMode";
 const char kReportSinkCount[] = "reportSinkCount";
 const char kOnInitialDataReceived[] = "onInitialDataReceived";
@@ -259,6 +261,10 @@ void MediaRouterWebUIMessageHandler::RegisterMessages() {
       kReportSelectedCastMode,
       base::Bind(&MediaRouterWebUIMessageHandler::OnReportSelectedCastMode,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
+      kReportNavigateToView,
+      base::Bind(&MediaRouterWebUIMessageHandler::OnReportNavigateToView,
+                 base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       kReportSinkCount,
       base::Bind(&MediaRouterWebUIMessageHandler::OnReportSinkCount,
@@ -408,6 +414,27 @@ void MediaRouterWebUIMessageHandler::OnReportClickedSinkIndex(
                               std::min(index, 100));
 }
 
+void MediaRouterWebUIMessageHandler::OnReportNavigateToView(
+  const base::ListValue* args) {
+  DVLOG(1) << "OnReportNavigateToView";
+  std::string view;
+  if (!args->GetString(0, &view)) {
+    DVLOG(1) << "Unable to extract args.";
+    return;
+  }
+
+  if (view == "cast-mode-list") {
+    base::RecordAction(base::UserMetricsAction(
+        "MediaRouter_Ui_Navigate_SinkListToSource"));
+  } else if (view == "route-details") {
+    base::RecordAction(base::UserMetricsAction(
+        "MediaRouter_Ui_Navigate_SinkListToRouteDetails"));
+  } else if (view == "sink-list") {
+    base::RecordAction(base::UserMetricsAction(
+        "MediaRouter_Ui_Navigate_RouteDetailsToSinkList"));
+  }
+}
+
 void MediaRouterWebUIMessageHandler::OnReportSelectedCastMode(
     const base::ListValue* args) {
   DVLOG(1) << "OnReportSelectedCastMode";

chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h

@@ -59,6 +59,7 @@ class MediaRouterWebUIMessageHandler : public content::WebUIMessageHandler {
   void OnCloseRoute(const base::ListValue* args);
   void OnCloseDialog(const base::ListValue* args);
   void OnReportClickedSinkIndex(const base::ListValue* args);
+  void OnReportNavigateToView(const base::ListValue* args);
   void OnReportSelectedCastMode(const base::ListValue* args);
   void OnReportSinkCount(const base::ListValue* args);
   void OnInitialDataReceived(const base::ListValue* args);

tools/metrics/actions/actions.xml

@@ -7770,6 +7770,38 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="MediaRouter_Ui_Navigate_Help">
+  <owner>apacible@chromium.org</owner>
+  <description>
+    User clicked the Media Router help menu item, located on the Media Router
+    contextual menu, to open the Cast help page.
+  </description>
+</action>
+
+<action name="MediaRouter_Ui_Navigate_RouteDetailsToSinkList">
+  <owner>apacible@chromium.org</owner>
+  <description>
+    User explicitly clicked the back button from the route details view to
+    navigate to the sink list view.
+  </description>
+</action>
+
+<action name="MediaRouter_Ui_Navigate_SinkListToRouteDetails">
+  <owner>apacible@chromium.org</owner>
+  <description>
+    User explicitly clicked a sink to navigate to the route details view from
+    the sink list view.
+  </description>
+</action>
+
+<action name="MediaRouter_Ui_Navigate_SinkListToSource">
+  <owner>apacible@chromium.org</owner>
+  <description>
+    User explicitly clicked to navigate from the sink view to the cast mode
+    view.
+  </description>
+</action>
+
 <action name="Menu_Take_Screenshot">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>