Add OpenGL occlusion query support to pepper.

ppapi/shared_impl/ppb_opengles2_shared.h

 // 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.
 
 #ifndef PPAPI_SHARED_IMPL_PPB_OPENGLES2_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_OPENGLES2_SHARED_H_
 
 #include "ppapi/c/ppb_opengles2.h"
 #include "ppapi/c/dev/ppb_opengles2ext_dev.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 class PPAPI_SHARED_EXPORT PPB_OpenGLES2_Shared {
  public:
   static const PPB_OpenGLES2* GetInterface();
   static const PPB_OpenGLES2InstancedArrays_Dev* GetInstancedArraysInterface();
   static const PPB_OpenGLES2FramebufferBlit_Dev* GetFramebufferBlitInterface();
   static const PPB_OpenGLES2FramebufferMultisample_Dev*
       GetFramebufferMultisampleInterface();
   static const PPB_OpenGLES2ChromiumEnableFeature_Dev*
       GetChromiumEnableFeatureInterface();
   static const PPB_OpenGLES2ChromiumMapSub_Dev* GetChromiumMapSubInterface();
+  static const PPB_OpenGLES2Query_Dev* GetQueryInterface();
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_OPENGLES2_SHARED_H_