Plumb through EGL_NV_post_sub_buffer and GLX_MESA_copy_sub_buffer.

gpu/command_buffer/client/gles2_cmd_helper_autogen.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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // DO NOT EDIT!
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_
@@ skipping 1229 matching lines @@
         GetCmdSpace<gles2::DestroyStreamTextureCHROMIUM>();
     c.Init(texture);
   }
 
   void GetTranslatedShaderSourceANGLE(GLuint shader, uint32 bucket_id) {
     gles2::GetTranslatedShaderSourceANGLE& c =
         GetCmdSpace<gles2::GetTranslatedShaderSourceANGLE>();
     c.Init(shader, bucket_id);
   }
 
+  void PostSubBufferCHROMIUM(GLint x, GLint y, GLint width, GLint height) {
+    gles2::PostSubBufferCHROMIUM& c =
+        GetCmdSpace<gles2::PostSubBufferCHROMIUM>();
+    c.Init(x, y, width, height);
+  }
+
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_CMD_HELPER_AUTOGEN_H_