Implement blacklist's force GPU capability in dual GPU machines.

content/public/common/gpu_switching_option.h

+// Copyright (c) 2012 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.
+
+#ifndef CONTENT_PUBLIC_COMMON_GPU_SWITCHING_OPTION_H_
+#define CONTENT_PUBLIC_COMMON_GPU_SWITCHING_OPTION_H_
+
+#include "build/build_config.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+enum GpuSwitchingOption {
+  GPU_SWITCHING_OPTION_AUTOMATIC,
+  GPU_SWITCHING_OPTION_FORCE_INTEGRATED,
+  GPU_SWITCHING_OPTION_FORCE_DISCRETE,
+  GPU_SWITCHING_OPTION_UNKNOWN
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_GPU_SWITCHING_OPTION_H_
+