Introducing ResumeLibrary to track system resume signal

chrome/browser/chromeos/cros/resume_library.h

+// Copyright (c) 2010 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_RESUME_LIBRARY_H_
+#define CHROME_BROWSER_CHROMEOS_CROS_RESUME_LIBRARY_H_
+#pragma once
+
+namespace chromeos {
+
+class ResumeLibrary {

[Nikita (slow), 2011/02/11 11:54:51]

Please add comment.

[glotov, 2011/02/11 18:20:56]

Done.

+ public:
+  class Observer {
+   public:
+    virtual void SystemResumed() = 0;

[Nikita (slow), 2011/02/11 11:54:51]

May be it makes sense to make this callback a part of PowerLibrary?

[glotov, 2011/02/11 18:20:56]

I thought about it and cons were that callbacks have different semantics and
there are no clients that use both power and suspend notifications. So I decided
to make small standalone component.

On 2011/02/11 11:54:51, Nikita Kostylev wrote:

+  };
+
+  virtual ~ResumeLibrary() {}
+
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+  // Factory function, creates a new instance and returns ownership.
+  // For normal usage, access the singleton via CrosLibrary::Get().
+  static ResumeLibrary* GetImpl(bool stub);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_CROS_RESUME_LIBRARY_H_