command_buffer: Implement CHROMIUM_framebuffer_mixed_samples extension

gpu/command_buffer/common/gles2_cmd_format_autogen.h

Index: gpu/command_buffer/common/gles2_cmd_format_autogen.h
diff --git a/gpu/command_buffer/common/gles2_cmd_format_autogen.h b/gpu/command_buffer/common/gles2_cmd_format_autogen.h
index 9b1a225eec6b2282455e9c43b1d0f82fd4c6236f..85fe48295716db79e7325afa8c3fac064437cb6e 100644
--- a/gpu/command_buffer/common/gles2_cmd_format_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_format_autogen.h
@@ -15490,6 +15490,39 @@ static_assert(offsetof(ProgramPathFragmentInputGenCHROMIUM,
               "offset of ProgramPathFragmentInputGenCHROMIUM coeffs_shm_offset "
               "should be 24");
 
+struct CoverageModulationCHROMIUM {
+  typedef CoverageModulationCHROMIUM ValueType;
+  static const CommandId kCmdId = kCoverageModulationCHROMIUM;
+  static const cmd::ArgFlags kArgFlags = cmd::kFixed;
+  static const uint8 cmd_flags = CMD_FLAG_SET_TRACE_LEVEL(3);
+
+  static uint32_t ComputeSize() {
+    return static_cast<uint32_t>(sizeof(ValueType));  // NOLINT
+  }
+
+  void SetHeader() { header.SetCmd<ValueType>(); }
+
+  void Init(GLenum _components) {
+    SetHeader();
+    components = _components;
+  }
+
+  void* Set(void* cmd, GLenum _components) {
+    static_cast<ValueType*>(cmd)->Init(_components);
+    return NextCmdAddress<ValueType>(cmd);
+  }
+
+  gpu::CommandHeader header;
+  uint32_t components;
+};
+
+static_assert(sizeof(CoverageModulationCHROMIUM) == 8,
+              "size of CoverageModulationCHROMIUM should be 8");
+static_assert(offsetof(CoverageModulationCHROMIUM, header) == 0,
+              "offset of CoverageModulationCHROMIUM header should be 0");
+static_assert(offsetof(CoverageModulationCHROMIUM, components) == 4,
+              "offset of CoverageModulationCHROMIUM components should be 4");
+
 struct BlendBarrierKHR {
   typedef BlendBarrierKHR ValueType;
   static const CommandId kCmdId = kBlendBarrierKHR;