gpu: Add a new extension CHROMIUM_deschedule.

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 897 matching lines @@
 
 void DestroyImageCHROMIUM(GLuint image_id) override;
 
 GLuint CreateGpuMemoryBufferImageCHROMIUM(GLsizei width,
                                           GLsizei height,
                                           GLenum internalformat,
                                           GLenum usage) override;
 
 void GetImageivCHROMIUM(GLuint image_id, GLenum param, GLint* data) override;
 
+void DescheduleUntilFinishedCHROMIUM() override;
+
 void GetTranslatedShaderSourceANGLE(GLuint shader,
                                     GLsizei bufsize,
                                     GLsizei* length,
                                     char* source) override;
 
 void PostSubBufferCHROMIUM(GLint x,
                            GLint y,
                            GLint width,
                            GLint height) override;
 
@@ skipping 247 matching lines @@
                              const char* name) override;
 
 GLint GetFragDataIndexEXT(GLuint program, const char* name) override;
 
 void UniformMatrix4fvStreamTextureMatrixCHROMIUM(
     GLint location,
     GLboolean transpose,
     const GLfloat* default_value) override;
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_AUTOGEN_H_