[Media Router] Add UMA histograms tracking component extension version/wakeups

chrome/browser/media/router/media_router_metrics.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_METRICS_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_METRICS_H_
 
+#include "base/gtest_prod_util.h"
 #include "base/time/time.h"
 
+namespace base {
+class Version;
+}  // namespace base
+
+namespace extensions {
+class Extension;
+}  // namespace extensions
+
 namespace media_router {
 
 // NOTE: Do not renumber enums as that would confuse interpretation of
 // previously logged data. When making changes, also update the enum list
 // in tools/metrics/histograms/histograms.xml to keep it in sync.
 
 // Where the user clicked to open the Media Router dialog.
 enum class MediaRouterDialogOpenOrigin {
   TOOLBAR = 0,
   OVERFLOW_MENU = 1,
@@ skipping 42 matching lines @@
   CHANGE_MODE = 0,
   START_LOCAL = 1,
   STOP_LOCAL = 2,
   CLOSE = 3,
   STATUS_REMOTE = 4,
 
   // Note: Add entries only immediately above this line.
   TOTAL_COUNT = 5
 };
 
+// The install status of the Media Router component extension.
+enum class MediaRouteProviderVersion {
+  // Installed but version is invalid or cannot be determined.
+  UNKNOWN = 0,
+  // Installed and the extension version matches the browser version.
+  SAME_VERSION_AS_CHROME = 1,
+  // Installed and the extension version is one version behind the browser
+  // version.
+  ONE_VERSION_BEHIND_CHROME = 2,
+  // Installed and the extension version is more than one version behind the
+  // browser version.
+  MULTIPLE_VERSIONS_BEHIND_CHROME = 3,
+  // Note: Add entries only immediately above this line.
+  TOTAL_COUNT = 4
+};
+
+// The outcome of an attempt to wake the Media Router component event page.
+enum class MediaRouteProviderWakeup {
+  SUCCESS = 0,
+  ERROR_UNKNOWN = 1,
+  ERROR_TOO_MANY_RETRIES = 2,
+  // Note: Add entries only immediately above this line.
+  TOTAL_COUNT = 3
+};
+
 class MediaRouterMetrics {
  public:
   // Records where the user clicked to open the Media Router dialog.
   static void RecordMediaRouterDialogOrigin(
       MediaRouterDialogOpenOrigin origin);
 
   // Records why the media route provider extension was woken up.
   static void RecordMediaRouteProviderWakeReason(
       MediaRouteProviderWakeReason reason);
 
   // Records the duration it takes for the Media Router dialog to open and
   // finish painting after a user clicks to open the dialog.
   static void RecordMediaRouterDialogPaint(
       const base::TimeDelta delta);
 
   // Records the duration it takes for the Media Router dialog to load its
   // initial data after a user clicks to open the dialog.
   static void RecordMediaRouterDialogLoaded(
       const base::TimeDelta delta);
 
   // Records the first action the user took after the Media Router dialog
   // opened.
   static void RecordMediaRouterInitialUserAction(
       MediaRouterUserAction action);
 
   // Records the outcome in a create route response.
   static void RecordRouteCreationOutcome(
       MediaRouterRouteCreationOutcome outcome);
+
+  // Records the installed version of the Media Router component extension.
+  static void RecordMediaRouteProviderVersion(
+      const extensions::Extension& extension);
+
+  // Records the outcome of an attempt to wake the Media Router component event
+  // page.
+  static void RecordMediaRouteProviderWakeup(MediaRouteProviderWakeup wakeup);
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(MediaRouteProviderMetricsTest,
+                           TestGetVersionDifference);
+
+  // Records the install status of the Media Router component extension.
+  static void RecordMediaRouteProviderVersion(
+      MediaRouteProviderVersion version);
+
+  // Returns the integer difference between the major versions of |first| and
+  // |second|, or std::numeric_limits<int>::min() if the difference cannot be
+  // determined.
+  static int GetVersionDifference(const base::Version& first,
+                                  const base::Version& second);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_METRICS_H_