Do V8 GC ASAP if system memory is pressured

chrome/browser/sessions/tab_loader.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_SESSIONS_TAB_LOADER_H_
 #define CHROME_BROWSER_SESSIONS_TAB_LOADER_H_
 
 #include <stddef.h>
 
 #include <list>
@@ skipping 97 matching lines @@
       CurrentMemoryPressureLevel();
 
   // React to memory pressure by stopping to load any more tabs.
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 
   scoped_ptr<TabLoaderDelegate> delegate_;
 
   // Listens for system under memory pressure notifications and stops loading
   // of tabs when we start running out of memory.
-  base::MemoryPressureListener memory_pressure_listener_;
+  base::MemoryPressureListener* memory_pressure_listener_;
 
   content::NotificationRegistrar registrar_;
 
   // The delay timer multiplier. See class description for details.
   size_t force_load_delay_multiplier_;
 
   // True if the tab loading is enabled.
   bool loading_enabled_;
 
   // The set of tabs we've initiated loading on. This does NOT include the
@@ skipping 16 matching lines @@
   // explicitly referenced so that it can be notified of deferred tab loads due
   // to memory pressure.
   scoped_refptr<SessionRestoreStatsCollector> stats_collector_;
 
   static TabLoader* shared_tab_loader_;
 
   DISALLOW_COPY_AND_ASSIGN(TabLoader);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_TAB_LOADER_H_