Add infrastructure for partial layouts

Source/core/rendering/RenderView.h

Index: Source/core/rendering/RenderView.h
diff --git a/Source/core/rendering/RenderView.h b/Source/core/rendering/RenderView.h
index 21ba4f4335933673f1cd4ffe9d09d1e50613f07f..fceac000133f0f597c164c0b6169ab3126e109d0 100644
--- a/Source/core/rendering/RenderView.h
+++ b/Source/core/rendering/RenderView.h
@@ -59,6 +59,8 @@ public:
     virtual void updateLogicalWidth() OVERRIDE;
     virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const OVERRIDE;
 
+    virtual bool supportsPartialLayout() const OVERRIDE { return true; }
+
     virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const OVERRIDE;
 
     // The same as the FrameView's layoutHeight/layoutWidth but with null check guards.
@@ -69,7 +71,7 @@ public:
 
     float zoomFactor() const;
 
-    FrameView* frameView() const { return m_frameView; }
+    FrameView* frameView() const OVERRIDE { return m_frameView; }

[eseidel, 2013/08/20 21:00:39]

virtual?

[esprehn, 2013/08/23 20:47:27]

This should not be virtual, just do document()->view() in RenderObject. Virtual
call overhead doesn't make sense. It's fine if RenderView shadows the impl on
RenderObject with a faster version.

(In truth we should probably eliminate this m_frameView thing and just use the
RenderObject frameView() that does document()->view().

[pdr., 2013/08/26 05:50:40]

Thanks for this explanation. Fixed

 
     virtual void computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect&, bool fixed = false) const OVERRIDE;
     void repaintViewRectangle(const LayoutRect&) const;