chromeos: power: Refactor RendererFreezer and add tests

chrome/browser/chromeos/power/renderer_freezer_delegate.h

+// Copyright 2014 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 CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_DELEGATE_H_
+#define CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_DELEGATE_H_
+
+#include "chrome/browser/chromeos/power/renderer_freezer.h"
+
+#include "base/files/file_path.h"
+
+namespace chromeos {
+
+class RendererFreezerDelegate : public RendererFreezer::Delegate {

[Daniel Erat, 2014/09/06 02:01:25]

i don't like the similarity of these names, but i also don't like the only
suggestion i can come up with, "RealRendererFreezerDelegate". hmm...
"CgroupRendererFreezerDelegate", maybe?

+ public:
+  RendererFreezerDelegate();
+  virtual ~RendererFreezerDelegate();
+
+  // RendererFreezer::Delegate overrides.
+  virtual bool FreezeRenderers() OVERRIDE;
+  virtual bool ThawRenderers() OVERRIDE;
+  virtual bool CanFreezeRenderers() OVERRIDE;
+
+ private:
+  base::FilePath state_path_;
+  bool enabled_;
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_DELEGATE_H_