command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

mojo/gpu/mojo_gles2_impl_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 872 matching lines @@
       GLenum transformType,
       const GLfloat* transformValues) override;
   void BindFragmentInputLocationCHROMIUM(GLuint program,
                                          GLint location,
                                          const char* name) override;
   void ProgramPathFragmentInputGenCHROMIUM(GLuint program,
                                            GLint location,
                                            GLenum genMode,
                                            GLint components,
                                            const GLfloat* coeffs) override;
+  void CoverageModulationCHROMIUM(GLenum components) override;
   GLenum GetGraphicsResetStatusKHR() override;
   void BlendBarrierKHR() override;
   void ApplyScreenSpaceAntialiasingCHROMIUM() override;
   void BindFragDataLocationIndexedEXT(GLuint program,
                                       GLuint colorNumber,
                                       GLuint index,
                                       const char* name) override;
   void BindFragDataLocationEXT(GLuint program,
                                GLuint colorNumber,
                                const char* name) override;
   GLint GetFragDataIndexEXT(GLuint program, const char* name) override;
 
  private:
   MojoGLES2Context context_;
 };
 
 }  // namespace mojo
 #endif  // MOJO_GPU_MOJO_GLES2_IMPL_AUTOGEN_H_