Resume a backgrounded renderer that was purged and suspended

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 61 matching lines @@
   // |test_tick_clock_| for more details.
   void set_test_tick_clock(base::TickClock* test_tick_clock);
 
   // Returns the auto-discardable state of the tab.
   // See tab_manager.h for more information.
   bool IsAutoDiscardable();
 
   // Sets/clears the auto-discardable state of the tab.
   void SetAutoDiscardableState(bool state);
 
+  // Sets the current purge-and-suspend state, and update the timestamp,
+  // 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;
+
+  // 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 {
     Data();
     bool operator==(const Data& right) const;
     bool operator!=(const Data& right) const;
 
     // TODO(georgesak): fix naming (no underscore).
@@ skipping 22 matching lines @@
   // for more details.
   base::TimeTicks NowTicks() const;
 
   // Contains all the needed data for the tab.
   Data tab_data_;
 
   // Pointer to a test clock. If this is set, NowTicks() returns the value of
   // this test clock. Otherwise it returns the system clock's value.
   base::TickClock* test_tick_clock_;
 
+  // The last time purge-and-suspend state was modified.
+  base::TimeTicks last_purge_and_suspend_modified_time_;
+
+  // 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_