command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

gpu/command_buffer/service/gles2_cmd_decoder_unittest_extensions_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 51 matching lines @@
 TEST_P(GLES2DecoderTestWithCHROMIUMPathRendering,
        PathStencilFuncCHROMIUMValidArgs) {
   EXPECT_CALL(*gl_, PathStencilFuncNV(GL_NEVER, 2, 3));
   SpecializedSetup<cmds::PathStencilFuncCHROMIUM, 0>(true);
   cmds::PathStencilFuncCHROMIUM cmd;
   cmd.Init(GL_NEVER, 2, 3);
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_NO_ERROR, GetGLError());
 }
 
+TEST_P(GLES2DecoderTestWithCHROMIUMFramebufferMixedSamples,
+       CoverageModulationCHROMIUMValidArgs) {
+  EXPECT_CALL(*gl_, CoverageModulationNV(GL_RGB));
+  SpecializedSetup<cmds::CoverageModulationCHROMIUM, 0>(true);
+  cmds::CoverageModulationCHROMIUM cmd;
+  cmd.Init(GL_RGB);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_NO_ERROR, GetGLError());
+}
+
 TEST_P(GLES2DecoderTestWithBlendEquationAdvanced, BlendBarrierKHRValidArgs) {
   EXPECT_CALL(*gl_, BlendBarrierKHR());
   SpecializedSetup<cmds::BlendBarrierKHR, 0>(true);
   cmds::BlendBarrierKHR cmd;
   cmd.Init();
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_NO_ERROR, GetGLError());
 }
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_UNITTEST_EXTENSIONS_AUTOGEN_H_