Link MediaSessionTabHelper with native MediaSession [CL is going to be split]

content/public/android/java/src/org/chromium/content_public/browser/WebContents.java

 // Copyright 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.
 
 package org.chromium.content_public.browser;
 
 import android.graphics.Bitmap;
 import android.graphics.Rect;
 import android.os.Parcelable;
 
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     /**
      * Requests a snapshop of accessibility tree. The result is provided asynchronously
      * using the callback
      * @param callback The callback to be called when the snapshot is ready. The callback
      *                 cannot be null.
      */
     void requestAccessibilitySnapshot(AccessibilitySnapshotCallback callback);
 
     /**
-     * Resumes the current media session.
+     * Add a {@link MediaSessionDelegate} to the native {@link MediaSession} of this
+     * {@link WebContents} object.
+     * @param delegate The delegate to be added to the native {@link MediaSession}
      */
-    void resumeMediaSession();
-
-    /**
-     * Suspends the current media session.
-     */
-    void suspendMediaSession();
-
-    /**
-     * Stops the current media session.
-     */
-    void stopMediaSession();
+    void addMediaSessionDelegate(MediaSessionDelegate delegate);
 
     /**
      * Add an observer to the WebContents
      *
      * @param observer The observer to add.
      */
     void addObserver(WebContentsObserver observer);
 
     /**
      * Remove an observer from the WebContents
@@ skipping 28 matching lines @@
      *                 0 means unlimited.
      * @param bypassCache If true, {@link url} is requested from the server even if it is present in
      *                 the browser cache.
      * @param callback The callback which will be called when the bitmaps are received from the
      *                 renderer.
      * @return The unique id of the download request
      */
     public int downloadImage(String url, boolean isFavicon, int maxBitmapSize,
             boolean bypassCache, ImageDownloadCallback callback);
 }