Create NetworkQuietDetector.

third_party/WebKit/Source/core/frame/LocalFrame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 219 matching lines @@
   // LocalFrameClient::GetInterfaceProvider() instead.
   //
   // TODO(crbug.com/726943): Remove this method.
   InterfaceProvider* GetInterfaceProvider() { return interface_provider_; }
 
   InterfaceRegistry* GetInterfaceRegistry() { return interface_registry_; }
 
   LocalFrameClient* Client() const;
 
   ContentSettingsClient* GetContentSettingsClient();
-  FrameResourceCoordinator* GetFrameResourceCoordinator() {
+  FrameResourceCoordinator* GetFrameResourceCoordinator() {  // can be null

[Zhen Wang, 2017/06/08 16:25:56]

nit: the comment should be in its own line, right?

[lpy, 2017/06/12 18:06:28]

Done.

     return frame_resource_coordinator_;
   }
 
   PluginData* GetPluginData() const;
 
   PerformanceMonitor* GetPerformanceMonitor() { return performance_monitor_; }
 
   // Convenience function to allow loading image placeholders for the request if
   // either the flag in Settings() for using image placeholders is set, or if
   // the embedder decides that Client Lo-Fi should be used for this request.
@@ skipping 169 matching lines @@
   explicit ScopedFrameBlamer(LocalFrame*);
   ~ScopedFrameBlamer();
 
  private:
   Member<LocalFrame> frame_;
 };
 
 }  // namespace blink
 
 #endif  // LocalFrame_h