Refactor chrome.alarms interface to support absolute alarm deadlines.

chrome/browser/extensions/api/alarms/alarms_api.h

 // Copyright (c) 2012 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_EXTENSIONS_API_ALARMS_ALARMS_API_H__
 #define CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARMS_API_H__
 #pragma once
 
 #include "chrome/browser/extensions/extension_function.h"
 
 namespace extensions {
 
 class AlarmsCreateFunction : public SyncExtensionFunction {
+  typedef base::Time (*TimeProvider)();
+ public:
+  AlarmsCreateFunction();
+  explicit AlarmsCreateFunction(TimeProvider now) : now_(now) {}
  protected:
   virtual ~AlarmsCreateFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("alarms.create");
+ private:
+  TimeProvider now_;
 };
 
 class AlarmsGetFunction : public SyncExtensionFunction {
  protected:
   virtual ~AlarmsGetFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("alarms.get");
 };
@@ skipping 21 matching lines @@
   virtual ~AlarmsClearAllFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("alarms.clearAll");
 };
 
 } //  namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARMS_API_H__