Add support for all blendmodes if we have GL_KHR_blend_equation_advanced.

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 7b7845b58ada878c0b265b2924a97c70e5692e10..b26afb1c976425f7d1d2e5d834b295d0e60f05ca 100644
--- a/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
+++ b/gpu/command_buffer/common/gles2_cmd_format_test_autogen.h
@@ -3432,4 +3432,13 @@ TEST_F(GLES2FormatTest, MatrixLoadIdentityCHROMIUM) {
   CheckBytesWrittenMatchesExpectedSize(next_cmd, sizeof(cmd));
 }
 
+TEST_F(GLES2FormatTest, BlendBarrierKHR) {
+  cmds::BlendBarrierKHR& cmd = *GetBufferAs<cmds::BlendBarrierKHR>();
+  void* next_cmd = cmd.Set(&cmd);
+  EXPECT_EQ(static_cast<uint32_t>(cmds::BlendBarrierKHR::kCmdId),
+            cmd.header.command);
+  EXPECT_EQ(sizeof(cmd), cmd.header.size * 4u);
+  CheckBytesWrittenMatchesExpectedSize(next_cmd, sizeof(cmd));
+}
+
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_TEST_AUTOGEN_H_