command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

gpu/command_buffer/client/gles2_implementation_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 3614 matching lines @@
                                                              GLenum coverMode) {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << GetLogPrefix()
                      << "] glStencilThenCoverStrokePathCHROMIUM(" << path
                      << ", " << reference << ", " << mask << ", "
                      << GLES2Util::GetStringPathCoverMode(coverMode) << ")");
   helper_->StencilThenCoverStrokePathCHROMIUM(path, reference, mask, coverMode);
   CheckGLError();
 }
 
+void GLES2Implementation::CoverageModulationCHROMIUM(GLenum components) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG(
+      "[" << GetLogPrefix() << "] glCoverageModulationCHROMIUM("
+          << GLES2Util::GetStringCoverageModulationComponents(components)
+          << ")");
+  helper_->CoverageModulationCHROMIUM(components);
+  CheckGLError();
+}
+
 void GLES2Implementation::BlendBarrierKHR() {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glBlendBarrierKHR("
                      << ")");
   helper_->BlendBarrierKHR();
   CheckGLError();
 }
 
 void GLES2Implementation::ApplyScreenSpaceAntialiasingCHROMIUM() {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << GetLogPrefix()
                      << "] glApplyScreenSpaceAntialiasingCHROMIUM("
                      << ")");
   helper_->ApplyScreenSpaceAntialiasingCHROMIUM();
   CheckGLError();
 }
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_IMPL_AUTOGEN_H_