command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

ui/gl/gl_bindings_api_autogen_gl.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
 // ui/gl/generate_bindings.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 172 matching lines @@
                            GLsizei height) override;
 void glCopyTexSubImage3DFn(GLenum target,
                            GLint level,
                            GLint xoffset,
                            GLint yoffset,
                            GLint zoffset,
                            GLint x,
                            GLint y,
                            GLsizei width,
                            GLsizei height) override;
+void glCoverageModulationNVFn(GLenum components) override;
 void glCoverFillPathInstancedNVFn(GLsizei numPaths,
                                   GLenum pathNameType,
                                   const void* paths,
                                   GLuint pathBase,
                                   GLenum coverMode,
                                   GLenum transformType,
                                   const GLfloat* transformValues) override;
 void glCoverFillPathNVFn(GLuint path, GLenum coverMode) override;
 void glCoverStrokePathInstancedNVFn(GLsizei numPaths,
                                     GLenum pathNameType,
@@ skipping 620 matching lines @@
                               GLsizei stride,
                               const void* ptr) override;
 void glVertexAttribPointerFn(GLuint indx,
                              GLint size,
                              GLenum type,
                              GLboolean normalized,
                              GLsizei stride,
                              const void* ptr) override;
 void glViewportFn(GLint x, GLint y, GLsizei width, GLsizei height) override;
 GLenum glWaitSyncFn(GLsync sync, GLbitfield flags, GLuint64 timeout) override;