Add initial GpuMemoryBufferSurfaceTexture implementation.

content/public/android/java/src/org/chromium/content/common/IChildProcessCallback.aidl

 // Copyright 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.common;
 
 import android.view.Surface;
 
 interface IChildProcessCallback {
 
   // Conduit to pass a Surface from the sandboxed renderer to the plugin.
   void establishSurfacePeer(
       int pid, in Surface surface, int primaryID, int secondaryID);
 
   Surface getViewSurface(int surfaceId);
+
+  Surface getSurfaceTextureSurface(int surfaceTextureId);
 }