Introducing ResumeLibrary to track system resume signal

chrome/browser/chromeos/cros/power_library.h

 // Copyright (c) 2009 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_CROS_POWER_LIBRARY_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_POWER_LIBRARY_H_
 #pragma once
 
 #include "base/observer_list.h"
 #include "base/singleton.h"
 #include "base/time.h"
 #include "third_party/cros/chromeos_power.h"
 
 namespace chromeos {
 
 // This interface defines interaction with the ChromeOS power library APIs.
 // Classes can add themselves as observers. Users can get an instance of this
 // library class like this: chromeos::CrosLibrary::Get()->GetPowerLibrary()
 class PowerLibrary {
  public:
   class Observer {
    public:
     virtual void PowerChanged(PowerLibrary* obj) = 0;
+    virtual void SystemResumed() = 0;
   };
   virtual ~PowerLibrary() {}
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
   // Whether or not the line power is connected.
   virtual bool line_power_on() const = 0;
 
   // Whether or not the battery is fully charged..
   virtual bool battery_fully_charged() const = 0;
 
@@ skipping 19 matching lines @@
   virtual void RequestShutdown() = 0;
 
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via CrosLibrary::Get().
   static PowerLibrary* GetImpl(bool stub);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_POWER_LIBRARY_H_