Add a method to set system UI visibility for ContentVideoView

content/public/android/java/src/org/chromium/content/browser/ContentVideoViewClient.java

 // Copyright 2013 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.browser;
 
 import android.view.View;
 
 /**
  *  Main callback class used by {@link ContentVideoView}.
@@ skipping 19 matching lines @@
      * Called to exit fullscreen video. Embedders must stop showing the view given in
      * {@link #enterFullscreenVideo(View)}. Must be implemented.
      */
     public void exitFullscreenVideo();
 
     /**
      * Allows the embedder to replace the view indicating that the video is loading.
      * If null is returned, the default video loading view is used.
      */
     public View getVideoLoadingProgressView();
+
+    /**
+     * Sets the system ui visibility after entering or exiting fullscreen.
+     * @param enterFullscreen True if video is going fullscreen, or false otherwise.
+     */
+    public void setSystemUiVisibility(boolean enterFullscreen);
 }