command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

gpu/command_buffer/common/gles2_cmd_format_test_autogen.h

Index: gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
diff --git a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
index 01847c9e7e740f63bc0dd523427b0ce2627ee825..8b9c540fb9934da8f6881cd193cd637e3ec28bb1 100644
--- a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
@@ -5281,6 +5281,17 @@ TEST_F(GLES2FormatTest, ProgramPathFragmentInputGenCHROMIUM) {
   CheckBytesWrittenMatchesExpectedSize(next_cmd, sizeof(cmd));
 }
 
+TEST_F(GLES2FormatTest, CoverageModulationCHROMIUM) {
+  cmds::CoverageModulationCHROMIUM& cmd =
+      *GetBufferAs<cmds::CoverageModulationCHROMIUM>();
+  void* next_cmd = cmd.Set(&cmd, static_cast<GLenum>(11));
+  EXPECT_EQ(static_cast<uint32_t>(cmds::CoverageModulationCHROMIUM::kCmdId),
+            cmd.header.command);
+  EXPECT_EQ(sizeof(cmd), cmd.header.size * 4u);
+  EXPECT_EQ(static_cast<GLenum>(11), cmd.components);
+  CheckBytesWrittenMatchesExpectedSize(next_cmd, sizeof(cmd));
+}
+
 TEST_F(GLES2FormatTest, BlendBarrierKHR) {
   cmds::BlendBarrierKHR& cmd = *GetBufferAs<cmds::BlendBarrierKHR>();
   void* next_cmd = cmd.Set(&cmd);