Do V8 GC ASAP if system memory is pressured

content/browser/renderer_host/renderer_frame_manager.cc

 // Copyright 2013 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.
 
 #include "content/browser/renderer_host/renderer_frame_manager.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 79 matching lines @@
     case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
       percentage = kCriticalPressurePercentage;
       break;
   }
   size_t frames = (max_number_of_saved_frames_ * percentage) / 100;
   return std::max(static_cast<size_t>(1), frames);
 }
 
 RendererFrameManager::RendererFrameManager()
     : memory_pressure_listener_(
-        base::Bind(&RendererFrameManager::OnMemoryPressure,
-                   base::Unretained(this))) {
+        base::MemoryPressureListener::Create(base::Bind(
+            &RendererFrameManager::OnMemoryPressure, base::Unretained(this)))) {
   // Note: With the destruction of this class the |memory_pressure_listener_|
   // gets destroyed and the observer will remove itself.
   max_number_of_saved_frames_ =
 #if defined(OS_ANDROID)
       1;
 #else
       std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256));
 #endif
   max_handles_ = base::SharedMemory::GetHandleLimit() / 8.0f;
 }
@@ skipping 34 matching lines @@
       percentage = kCriticalPressurePercentage;
       break;
     case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
       // No need to change anything when there is no pressure.
       return;
   }
   CullUnlockedFrames(std::max(1, (saved_frame_limit * percentage) / 100));
 }
 
 }  // namespace content