Add Resume logic of Purge+Suspend to TabManager.

chrome/browser/memory/tab_manager_web_contents_data.h

 // Copyright 2015 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_MEMORY_TAB_MANAGER_WEB_CONTENTS_DATA_H_
 #define CHROME_BROWSER_MEMORY_TAB_MANAGER_WEB_CONTENTS_DATA_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "chrome/browser/memory/tab_manager.h"
@@ skipping 72 matching lines @@
   // i.e. the last purge-and-suspend modified time.
   // TODO(tasak): remove this after PurgeAndSuspend code is moved into
   // MemoryCoordinator.
   void SetPurgeAndSuspendState(TabManager::PurgeAndSuspendState state);
 
   // Returns the last purge-and-suspend modified time.
   // TODO(tasak): remove this after PurgeAndSuspend code is moved into
   // MemoryCoordinator.
   base::TimeTicks LastPurgeAndSuspendModifiedTime() const;
 
+  // Sets the timestamp of the last modified time the purge-and-suspend state
+  // of the tab was changed for testing.
+  void SetLastPurgeAndSuspendModifiedTimeForTesting(base::TimeTicks timestamp);
+
   // Returns the current state of purge-and-suspend.
   // TODO(tasak): remove this after PurgeAndSuspend code is moved into
   // MemoryCoordinator.
   TabManager::PurgeAndSuspendState GetPurgeAndSuspendState() const;
 
  private:
   // Needed to access tab_data_.
   FRIEND_TEST_ALL_PREFIXES(TabManagerWebContentsDataTest, CopyState);
 
   struct Data {
@@ skipping 39 matching lines @@
 
   // The current state of purge-and-suspend.
   PurgeAndSuspendState purge_and_suspend_state_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsData);
 };
 
 }  // namespace memory
 
 #endif  // CHROME_BROWSER_MEMORY_TAB_MANAGER_WEB_CONTENTS_DATA_H_