Issue trace events to gather repaint information.

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google 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 99 matching lines @@
 };
 
 enum MapCoordinatesMode {
     IsFixed = 1 << 0,
     UseTransforms = 1 << 1,
     ApplyContainerFlip = 1 << 2,
     TraverseDocumentBoundaries = 1 << 3,
 };
 typedef unsigned MapCoordinatesFlags;
 
+enum InvalidationReason {
+    InvalidationIncremental,
+    InvalidationSelfLayout,
+    InvalidationBorderFitLines,
+    InvalidationBorderRadius,
+    InvalidationBoundsChangeWithBackground,
+    InvalidationBoundsChange,
+    InvalidationScroll,
+    InvalidationSelection,
+    InvalidationLayer,
+    InvalidationRepaint,
+    InvalidationRepaintRectangle
+};
+
 const int caretWidth = 1;
 
 struct AnnotatedRegionValue {
     bool operator==(const AnnotatedRegionValue& o) const
     {
         return draggable == o.draggable && bounds == o.bounds;
     }
 
     LayoutRect bounds;
     bool draggable;
@@ skipping 664 matching lines @@
         TextDecorationStyle style;
         AppliedTextDecoration() : color(Color::transparent), style(TextDecorationStyleSolid) { }
     };
 
     void getTextDecorations(unsigned decorations, AppliedTextDecoration& underline, AppliedTextDecoration& overline, AppliedTextDecoration& linethrough, bool quirksMode = false, bool firstlineStyle = false);
 
     // Return the RenderLayerModelObject in the container chain which is responsible for painting this object, or 0
     // if painting is root-relative. This is the container that should be passed to the 'forRepaint'
     // methods.
     RenderLayerModelObject* containerForRepaint() const;
+
     // Actually do the repaint of rect r for this object which has been computed in the coordinate space
     // of repaintContainer. If repaintContainer is 0, repaint via the view.
-    void repaintUsingContainer(const RenderLayerModelObject* repaintContainer, const IntRect&) const;
+    void repaintUsingContainer(const RenderLayerModelObject* repaintContainer, const IntRect&, InvalidationReason) const;
 
     // Repaint the entire object.  Called when, e.g., the color of a border changes, or when a border
     // style changes.
     void repaint() const;
 
     // Repaint a specific subrectangle within a given object.  The rect |r| is in the object's coordinate space.
     void repaintRectangle(const LayoutRect&) const;
 
     // Repaint only if our old bounds and new bounds are different. The caller may pass in newBounds if they are known.
     bool repaintAfterLayoutIfNeeded(const RenderLayerModelObject* repaintContainer, bool wasSelfLayout,
@@ skipping 244 matching lines @@
     RenderStyle* cachedFirstLineStyle() const;
     StyleDifference adjustStyleDifference(StyleDifference, unsigned contextSensitiveProperties) const;
 
     Color selectionColor(int colorProperty) const;
 
     void removeShapeImageClient(ShapeValue*);
 
 #ifndef NDEBUG
     void checkBlockPositionedObjectsNeedLayout();
 #endif
+    const char* invalidationReasonToString(const InvalidationReason) const;

[Julien - ping for review, 2014/03/31 20:11:04]

Same comment about |const| InvalidationReason.

[dsinclair, 2014/03/31 20:22:10]

Done.

 
     RefPtr<RenderStyle> m_style;
 
     Node* m_node;
 
     RenderObject* m_parent;
     RenderObject* m_previous;
     RenderObject* m_next;
 
 #ifndef NDEBUG
@@ skipping 345 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h