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

ui/gl/gpu_switching_manager.cc

+// 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.
+
+#include "ui/gl/gpu_switching_manager.h"
+
+#include "base/logging.h"
+
+namespace gfx {
+
+// static
+GpuSwitchingManager* GpuSwitchingManager::GetInstance() {
+  return Singleton<GpuSwitchingManager>::get();
+}
+
+GpuSwitchingManager::GpuSwitchingManager() {
+}
+
+GpuSwitchingManager::~GpuSwitchingManager() {
+}
+
+void GpuSwitchingManager::ForceUseOfIntegratedGpu() {
+  gpu_switching_option_.clear();
+  gpu_switching_option_.push_back(PreferIntegratedGpu);
+}
+
+void GpuSwitchingManager::ForceUseOfDiscreteGpu() {
+  gpu_switching_option_.clear();
+  gpu_switching_option_.push_back(PreferDiscreteGpu);
+}
+
+GpuPreference GpuSwitchingManager::AdjustGpuPreference(
+    GpuPreference gpu_preference) {
+  if (gpu_switching_option_.size() == 0)
+    return gpu_preference;
+  DCHECK_EQ(gpu_switching_option_.size(), 1u);
+  return gpu_switching_option_[0];
+}
+
+}  // namespace gfx
+