Add Pepper support for several GL extensions

ppapi/lib/gl/gles2/gl2ext_ppapi.h

 // Copyright (c) 2011 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>
@@ skipping 18 matching lines @@
 
 // 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_OpenGLES2* GL_APIENTRY glGetInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2InstancedArrays* GL_APIENTRY
+    glGetInstancedArraysInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2FramebufferBlit* GL_APIENTRY
+    glGetFramebufferBlitInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2FramebufferMultisample* GL_APIENTRY
+    glGetFramebufferMultisampleInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2ChromiumEnableFeature* GL_APIENTRY
+    glGetChromiumEnableFeatureInterfacePPAPI();
+GL_APICALL const struct PPB_OpenGLES2ChromiumMapSub* GL_APIENTRY
+    glGetChromiumMapSubInterfacePPAPI();
 
 #ifdef __cplusplus
 }
 #endif  // __cplusplus
 
 #endif  // PPAPI_LIB_GL_GLES2_GL2EXT_PPAPI_H_