[Media Router] Adds return value to mojo MediaRouteProvider::TerminateRoute.

chrome/browser/media/router/mojo/media_router_mojo_metrics.cc

 // Copyright 2016 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/mojo/media_router_mojo_metrics.h"
 
 #include "base/macros.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/version.h"
 #include "components/version_info/version_info.h"
@@ skipping 32 matching lines @@
 void MediaRouterMojoMetrics::RecordMediaRouteProviderWakeup(
     MediaRouteProviderWakeup wakeup) {
   DCHECK_LT(static_cast<int>(wakeup),
             static_cast<int>(MediaRouteProviderWakeup::TOTAL_COUNT));
   UMA_HISTOGRAM_ENUMERATION(
       "MediaRouter.Provider.Wakeup", static_cast<int>(wakeup),
       static_cast<int>(MediaRouteProviderWakeup::TOTAL_COUNT));
 }
 
 // static
+void MediaRouterMojoMetrics::RecordMediaRouteProviderTerminateRoute(
+    RouteRequestResult::ResultCode result_code) {
+  DCHECK_LT(result_code, RouteRequestResult::ResultCode::TOTAL_COUNT);
+  UMA_HISTOGRAM_ENUMERATION(
+      "MediaRouter.Provider.TerminateRoute.Result", result_code,
+      RouteRequestResult::ResultCode::TOTAL_COUNT);
+}
+
+// static
 MediaRouteProviderVersion MediaRouterMojoMetrics::GetMediaRouteProviderVersion(
     const base::Version& extension_version,
     const base::Version& browser_version) {
   if (!extension_version.IsValid() || extension_version.components().empty() ||
       !browser_version.IsValid() || browser_version.components().empty()) {
     return MediaRouteProviderVersion::UNKNOWN;
   }
 
   uint32_t extension_major = extension_version.components()[0];
   uint32_t browser_major = browser_version.components()[0];
   // Sanity check.
   if (extension_major == 0 || browser_major == 0) {
     return MediaRouteProviderVersion::UNKNOWN;
   } else if (extension_major >= browser_major) {
     return MediaRouteProviderVersion::SAME_VERSION_AS_CHROME;
   } else if (browser_major - extension_major == 1) {
     return MediaRouteProviderVersion::ONE_VERSION_BEHIND_CHROME;
   } else {
     return MediaRouteProviderVersion::MULTIPLE_VERSIONS_BEHIND_CHROME;
   }
 }
 
 }  // namespace media_router