Remove updatePaintingInfoForFragments() and per-fragment shouldPaintContent flag.

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index 9a55d8e62b716157c0c9879df8c8fef34616b880..63a73d268dc804e2c547ffb41f0c7362a2c21b96 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -516,10 +516,13 @@ public:
         return m_hasSelfPaintingLayerDescendant;
     }
     LayoutRect paintingExtent(const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation, PaintBehavior);
-    void collectFragments(LayerFragments&, const RenderLayer* rootLayer, const LayoutRect& dirtyRect,
-        ClipRectsCacheSlot, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize,
-        ShouldRespectOverflowClip = RespectOverflowClip, const LayoutPoint* offsetFromRoot = 0,
-        const LayoutSize& subPixelAccumulation = LayoutSize(), const LayoutRect* layerBoundingBox = 0);
+
+    enum DirtyRectIntersectionResult {
+        NotIntersectingDirtyRect,
+        IntersectingDirtyRect
+    };
+    // FIXME: insane number of parameters. Should we introduce a CollectFragmentsContext or something?
+    void collectFragments(LayerFragments&, DirtyRectIntersectionResult*, const RenderLayer* rootLayer, const LayoutRect& dirtyRect, ClipRectsCacheSlot, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip = RespectOverflowClip, const LayoutPoint* offsetFromRoot = 0, const LayoutSize& subPixelAccumulation = LayoutSize(), const LayoutRect* layerBoundingBox = 0);
 
     LayoutPoint renderBoxLocation() const { return renderer()->isBox() ? toRenderBox(renderer())->location() : LayoutPoint(); }