Add OrderingBarrierCHROMIUM API.

gpu/command_buffer/client/gles2_implementation_autogen.h

 // Copyright 2014 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
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 413 matching lines @@
 
 void ShaderSource(GLuint shader,
                   GLsizei count,
                   const GLchar* const* str,
                   const GLint* length) override;
 
 void ShallowFinishCHROMIUM() override;
 
 void ShallowFlushCHROMIUM() override;
 
+void ShallowShallowFlushCHROMIUM() override;
+
 void StencilFunc(GLenum func, GLint ref, GLuint mask) override;
 
 void StencilFuncSeparate(GLenum face,
                          GLenum func,
                          GLint ref,
                          GLuint mask) override;
 
 void StencilMask(GLuint mask) override;
 
 void StencilMaskSeparate(GLenum face, GLuint mask) override;
@@ skipping 479 matching lines @@
 
 void SwapInterval(GLint interval) override;
 
 void MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) override;
 
 void MatrixLoadIdentityCHROMIUM(GLenum matrixMode) override;
 
 void BlendBarrierKHR() override;
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_AUTOGEN_H_