memory coordinator: Add MemoryCoordinatorClient::OnPurgeMemory()

content/browser/renderer_host/renderer_frame_manager.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_
 
 #include <stddef.h>
 
 #include <list>
@@ skipping 40 matching lines @@
   void set_max_handles(float max_handles) { max_handles_ = max_handles; }
 
  private:
   // Please remove when crbug.com/443824 has been fixed.
   friend class RenderWidgetHostViewAuraTest;
 
   RendererFrameManager();
   ~RendererFrameManager() override;
 
   // base::MemoryCoordinatorClient implementation:
-  void OnMemoryStateChange(base::MemoryState state) override;
+  void OnPurgeMemory() override;
 
   void CullUnlockedFrames(size_t saved_frame_limit);
 
   // React on memory pressure events to adjust the number of cached frames.
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 
   void PurgeMemory(int percentage);
 
   friend struct base::DefaultSingletonTraits<RendererFrameManager>;
 
   // Listens for system under pressure notifications and adjusts number of
   // cached frames accordingly.
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
   std::map<RendererFrameManagerClient*, size_t> locked_frames_;
   std::list<RendererFrameManagerClient*> unlocked_frames_;
   size_t max_number_of_saved_frames_;
   float max_handles_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererFrameManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_