Make render pipeline throttling opt-in

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

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 212 matching lines @@
     void updateWidgetGeometries();
 
     void addPartToUpdate(LayoutEmbeddedObject&);
 
     void setIsPainting(bool val) const { m_isPainting = val; }
     bool isPainting() const;
 
     Color documentBackgroundColor() const;
 
     // Run all needed lifecycle stages. After calling this method, all frames will be in the lifecycle state PaintInvalidationClean.
-    // If lifecycle throttling is allowed (see DocumentLifecycle::PreventThrottlingScope), some frames may skip the lifecycle update
+    // If lifecycle throttling is allowed (see DocumentLifecycle::AllowThrottlingScope), some frames may skip the lifecycle update
     // (e.g., based on visibility) and will not end up being PaintInvalidationClean.
     void updateAllLifecyclePhases();
 
     // Computes the style, layout and compositing lifecycle stages if needed. After calling this method, all frames will be in a lifecycle
     // state >= CompositingClean, and scrolling has been updated (unless throttling is allowed).
     void updateLifecycleToCompositingCleanPlusScrolling();
 
     // Computes only the style and layout lifecycle stages.
     // After calling this method, all frames will be in a lifecycle state >= LayoutClean (unless throttling is allowed).
     void updateLifecycleToLayoutClean();
@@ skipping 690 matching lines @@
     if (m_visuallyNonEmptyPixelCount > visualPixelThreshold)
         setIsVisuallyNonEmpty();
 }
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
 DEFINE_TYPE_CASTS(FrameView, ScrollableArea, scrollableArea, scrollableArea->isFrameView(), scrollableArea.isFrameView());
 
 } // namespace blink
 
 #endif // FrameView_h