Adds histograms for casting feature of Video Player

ui/file_manager/video_player/js/video_player_metrics.js

Index: ui/file_manager/video_player/js/video_player_metrics.js
diff --git a/ui/file_manager/file_manager/foreground/js/metrics.js b/ui/file_manager/video_player/js/video_player_metrics.js
similarity index 54%
copy from ui/file_manager/file_manager/foreground/js/metrics.js
copy to ui/file_manager/video_player/js/video_player_metrics.js
index cae363523bdc6fe9e0d3d393485dbc0c5f57bf2a..4a17c42302ab9ce160e7fce4827de52aecdd812d 100644
--- a/ui/file_manager/file_manager/foreground/js/metrics.js
+++ b/ui/file_manager/video_player/js/video_player_metrics.js
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2014 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.
 
@@ -8,10 +8,23 @@
  * To be included as a first script in main.html
  */
 
+/**
+ * @extends {metricsBase}
+ */
 var metrics = metricsBase;
 
-metrics.startInterval('Load.Total');
-metrics.startInterval('Load.Script');
+/**
+ * Values for "VideoPlayer.CastExtensionStaus" metrics.
+ * @enum {number}
+ */
+metrics.CAST_EXTENSION = {
+  EXTENSION_UNAVAILABLE: 0,
+  API_INSTALLATION_FAILED: 1,
+  API_LOAD_FAILED: 2,
+  API_INSTALLED_AND_LOADED: 3,
+  API_AVAILABLE_AND_LOADED: 4,
+  MAX_VALUE: 4
+};
 
 /**
  * Convert a short metric name to the full format.
@@ -22,5 +35,5 @@ metrics.startInterval('Load.Script');
  * @private
  */
 metrics.convertName_ = function(name) {
-  return 'FileBrowser.' + name;
+  return 'VideoPlayer.' + name;
 };