Moved the logic of maintaining the current context to gles2 helper library.

ppapi/lib/gl/gles2/gl2ext_ppapi.h

 // Copyright (c) 2010 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.
 
 // OpenGL ES 2.0 extensions for PPAPI.
 
 #ifndef PPAPI_LIB_GL_GLES2_GL2EXT_PPAPI_H_
 #define PPAPI_LIB_GL_GLES2_GL2EXT_PPAPI_H_
 
 #include <GLES2/gl2platform.h>
 
-#include "ppapi/c/pp_module.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/ppb.h"
 #include "ppapi/c/dev/ppb_opengles_dev.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif  // __cplusplus
 
 // Initializes OpenGL ES 2.0 library.
 // Must be called once before making any gl calls.
 // GL_FALSE is returned on failure, GL_TRUE otherwise.
-GL_APICALL int GL_APIENTRY glInitializePPAPI(
-    PP_Module module,
+GL_APICALL GLboolean GL_APIENTRY glInitializePPAPI(
     PPB_GetInterface get_browser_interface);
 
 // Terminates OpenGL ES 2.0 library.
 // GL_FALSE is returned on failure, GL_TRUE otherwise.
-GL_APICALL int GL_APIENTRY glTerminatePPAPI();
+GL_APICALL GLboolean GL_APIENTRY glTerminatePPAPI();
 
 // Sets context to be used for rendering in the current thread.
 GL_APICALL void GL_APIENTRY glSetCurrentContextPPAPI(PP_Resource context);
 
 // Gets context being used for rendering in the current thread.
 // Returns NULL if a context has not been set yet.
 GL_APICALL PP_Resource GL_APIENTRY glGetCurrentContextPPAPI();
 
 // Returns OpenGL ES 2.0 interface.
-GL_APICALL const struct PPB_OpenGLES_Dev* GL_APIENTRY glGetInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2_Dev* GL_APIENTRY glGetInterfacePPAPI();
 
 #ifdef __cplusplus
 }
 #endif  // __cplusplus
 
 #endif  // PPAPI_LIB_GL_GLES2_GL2EXT_PPAPI_H_