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

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

Index: chrome/browser/media/router/mojo/media_router_mojo_metrics.h
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_metrics.h b/chrome/browser/media/router/mojo/media_router_mojo_metrics.h
index bd13db6cfb83d4d22702b51537ae3ae78129777d..431fc1fab7b03c760ca72c2e1448c6956cd00a09 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_metrics.h
+++ b/chrome/browser/media/router/mojo/media_router_mojo_metrics.h
@@ -7,6 +7,7 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/time/time.h"
+#include "chrome/browser/media/router/route_request_result.h"
 
 namespace base {
 class Version;
@@ -19,7 +20,7 @@ class Extension;
 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
+// previously logged data. When making changes, also update the enum lists
 // in tools/metrics/histograms/histograms.xml to keep it in sync.
 
 // Why the Media Route Provider process was woken up.
@@ -86,6 +87,11 @@ class MediaRouterMojoMetrics {
   // page.
   static void RecordMediaRouteProviderWakeup(MediaRouteProviderWakeup wakeup);
 
+  // Records the outcome of a call to terminateRoute() on the Media Route
+  // Provider Manager.
+  static void RecordMediaRouteProviderTerminateRoute(
+      RouteRequestResult::ResultCode result_code);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(MediaRouterMojoMetricsTest,
                            TestGetMediaRouteProviderVersion);