Re-land chromeos: Add non-extension renderers to the freezer cgroup

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 <string>
+
 #include "base/files/file_path.h"
 #include "base/macros.h"
+#include "base/process/process_handle.h"
 #include "chrome/browser/chromeos/power/renderer_freezer.h"
 
 namespace chromeos {
 
 // Manages all the processes in the freezer cgroup on Chrome OS.
 class FreezerCgroupProcessManager : public RendererFreezer::Delegate {
  public:
   FreezerCgroupProcessManager();
-  virtual ~FreezerCgroupProcessManager();
+  ~FreezerCgroupProcessManager() override;
 
   // RendererFreezer::Delegate overrides.
-  virtual bool FreezeRenderers() override;
-  virtual bool ThawRenderers() override;
-  virtual bool CanFreezeRenderers() override;
+  void SetShouldFreezeRenderer(base::ProcessHandle handle,
+                               bool frozen) override;
+  bool FreezeRenderers() override;
+  bool ThawRenderers() override;
+  bool CanFreezeRenderers() override;
 
  private:
-  bool WriteCommandToStateFile(const std::string& command);
+  bool WriteCommandToFile(const std::string& command,
+                          const base::FilePath& file);
 
-  base::FilePath state_path_;
+  // Control path for the cgroup that is not frozen.
+  base::FilePath default_control_path_;
+
+  // Control and state paths for the cgroup whose processes will be frozen.
+  base::FilePath to_be_frozen_control_path_;
+  base::FilePath to_be_frozen_state_path_;
+
   bool enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(FreezerCgroupProcessManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_POWER_FREEZER_CGROUP_PROCESS_MANAGER_H_