Keep screen on when there is an active WebRTC session on Android.

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

 // Copyright (c) 2012 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.content.Context;
 import android.view.View;
 
 /**
  * Allows customization for clients of the ContentVideoView.
  * The implementer is responsible for displaying the Android view when
  * {@link #onShowCustomView(View)} is called.
  */
 public interface ContentVideoViewContextDelegate {
     public void onShowCustomView(View view);
     public void onDestroyContentVideoView();
+    public void keepScreenOn(boolean screenOn);
     public Context getContext();
     public View getVideoLoadingProgressView();
 }