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

ui/gl/gpu_switching_manager.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 UI_GL_GPU_SWITCHING_MANAGER_H_
+#define UI_GL_GPU_SWITCHING_MANAGER_H_
+
+#include <vector>
+
+#include "base/memory/singleton.h"
+#include "ui/gl/gl_export.h"
+#include "ui/gl/gpu_preference.h"
+
+namespace gfx {
+
+class GL_EXPORT GpuSwitchingManager {
+ public:
+  // Getter for the singleton. This will return NULL on failure.
+  static GpuSwitchingManager* GetInstance();
+
+  // Set the switching option, but don't take any actions until later
+  // we access GPU.
+  void ForceUseOfIntegratedGpu();
+  void ForceUseOfDiscreteGpu();
+
+  // Adjust GpuPreference based on the current switching option.
+  // If none is set, return the original GpuPreference.
+  GpuPreference AdjustGpuPreference(GpuPreference gpu_preference);
+
+ private:
+  friend struct DefaultSingletonTraits<GpuSwitchingManager>;
+
+  GpuSwitchingManager();
+  virtual ~GpuSwitchingManager();
+
+  std::vector<GpuPreference> gpu_switching_option_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuSwitchingManager);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_GPU_SWITCHING_MANAGER_H_
+