chromeos: power: Refactor RendererFreezer and add tests

chrome/browser/chromeos/power/freezer_cgroup_process_manager.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_FREEZER_CGROUP_PROCESS_MANAGER_H_
+#define CHROME_BROWSER_CHROMEOS_POWER_FREEZER_CGROUP_PROCESS_MANAGER_H_
+
+#include "base/files/file_path.h"
+#include "chrome/browser/chromeos/power/renderer_freezer.h"
+
+namespace chromeos {
+
+// Manages all the processes in the freezer cgroup on chrome os.

[Daniel Erat, 2014/09/12 22:53:22]

nit: s/chrome os/Chrome OS/

+class FreezerCgroupProcessManager : public RendererFreezer::Delegate {

[Chirantan Ekbote, 2014/09/12 22:35:09]

I named it this because I'll be adding more code to this class to actually
manage the processes in the freezer cgroup.

+ public:
+  FreezerCgroupProcessManager();
+  virtual ~FreezerCgroupProcessManager();
+
+  // RendererFreezer::Delegate overrides.
+  virtual bool FreezeRenderers() OVERRIDE;
+  virtual bool ThawRenderers() OVERRIDE;
+  virtual bool CanFreezeRenderers() OVERRIDE;
+
+ private:
+  base::FilePath state_path_;
+  bool enabled_;
+};

[Daniel Erat, 2014/09/12 22:53:22]

include base/macros.h and add DISALLOW_COPY_AND_ASSIGN

+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_POWER_FREEZER_CGROUP_PROCESS_MANAGER_H_