[Media Router] Allow casting new media to sink with existing route.

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"
 
@@ skipping 28 matching lines @@
 };
 
 // The possible actions a user can take while interacting with the Media Router
 // dialog.
 enum class MediaRouterUserAction {
   CHANGE_MODE = 0,
   START_LOCAL = 1,
   STOP_LOCAL = 2,
   CLOSE = 3,
   STATUS_REMOTE = 4,
+  REPLACE_LOCAL_ROUTE = 5,
 
   // Note: Add entries only immediately above this line.
-  TOTAL_COUNT = 5
+  TOTAL_COUNT = 6
 };
 
 class MediaRouterMetrics {
  public:
   // Records where the user clicked to open the Media Router dialog.
   static void RecordMediaRouterDialogOrigin(
       MediaRouterDialogOpenOrigin origin);
 
   // Records the duration it takes for the Media Router dialog to open and
   // finish painting after a user clicks to open the dialog.
@@ skipping 11 matching lines @@
       MediaRouterUserAction action);
 
   // Records the outcome in a create route response.
   static void RecordRouteCreationOutcome(
       MediaRouterRouteCreationOutcome outcome);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_METRICS_H_