mac: Load the system hotkeys after launch.

chrome/browser/ui/cocoa/system_hotkey_helper_mac.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_UI_COCOA_SYSTEM_HOTKEY_HELPER_MAC_H_
+#define CHROME_BROWSER_UI_COCOA_SYSTEM_HOTKEY_HELPER_MAC_H_
+
+#include "base/memory/singleton.h"
+#include "base/memory/weak_ptr.h"
+
+class SystemHotkeyMap;
+
+class SystemHotkeyHelperMac {
+ public:
+  // Return pointer to the singleton instance for the current process.
+  static SystemHotkeyHelperMac* GetInstance();
+
+  // Loads the system hot keys after a brief delay, to reduce file system access
+  // immediately after launch.
+  void DeferredLoadSystemHotkeys();
+
+  // Guaranteed to not be NULL.
+  SystemHotkeyMap* map() { return map_.get(); }
+
+ private:
+  friend struct DefaultSingletonTraits<SystemHotkeyHelperMac>;
+
+  SystemHotkeyHelperMac();
+  virtual ~SystemHotkeyHelperMac();
+
+  // Retrieves the relevant plist file from disk on a background thread, and
+  // parses it on the main thread.
+  void LoadSystemHotkeys();
+
+  scoped_ptr<SystemHotkeyMap> map_;
+  base::WeakPtrFactory<SystemHotkeyHelperMac> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemHotkeyHelperMac);
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_SYSTEM_HOTKEY_HELPER_MAC_H_