Make purge-and-suspend-time finch experiment parameter

chrome/browser/memory/tab_manager.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_MEMORY_TAB_MANAGER_H_
 #define CHROME_BROWSER_MEMORY_TAB_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 348 matching lines @@
   // used for statistics normalized by usage.
   bool recent_tab_discard_;
 
   // Whether a tab can only ever discarded once.
   bool discard_once_;
 
   // This allows protecting tabs for a certain amount of time after being
   // backgrounded.
   base::TimeDelta minimum_protection_time_;
 
+  // A backgrounded renderer will be suspended when this time passes.
+  base::TimeDelta time_to_first_suspension_;
+
 #if defined(OS_CHROMEOS)
   std::unique_ptr<TabManagerDelegate> delegate_;
 #endif
 
   // Responsible for automatically registering this class as an observer of all
   // TabStripModels. Automatically tracks browsers as they come and go.
   BrowserTabStripTracker browser_tab_strip_tracker_;
 
   // 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.
@@ skipping 38 matching lines @@
 
   // Weak pointer factory used for posting delayed tasks to task_runner_.
   base::WeakPtrFactory<TabManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabManager);
 };
 
 }  // namespace memory
 
 #endif  // CHROME_BROWSER_MEMORY_TAB_MANAGER_H_