Throttle rendering pipeline for invisible iframes

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)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 162 matching lines @@
     bool shouldScrollTopControls(const FloatSize& delta) const;
 
 #if ENABLE(OILPAN)
     void registerPluginElement(HTMLPlugInElement*);
     void unregisterPluginElement(HTMLPlugInElement*);
     void clearWeakMembers(Visitor*);
 #endif
     DisplayItemClient displayItemClient() const { return toDisplayItemClient(this); }
     String debugName() const { return "LocalFrame"; }
 
+    bool shouldThrottleRenderingPipeline() const;
+    bool shouldThrottleStyleLayoutAndCompositingUpdates() const;
+
     // ========
 
 private:
     LocalFrame(FrameLoaderClient*, FrameHost*, FrameOwner*);
 
     // Internal Frame helper overrides:
     WindowProxyManager* windowProxyManager() const override;
 
     String localLayerTreeAsText(unsigned flags) const;
 
@@ skipping 121 matching lines @@
 DECLARE_WEAK_IDENTIFIER_MAP(LocalFrame);
 
 } // namespace blink
 
 // During refactoring, there are some places where we need to do type conversions that
 // will not be needed once all instances of LocalFrame and RemoteFrame are sorted out.
 // At that time this #define will be removed and all the uses of it will need to be corrected.
 #define toLocalFrameTemporary toLocalFrame
 
 #endif // LocalFrame_h