Ignore overflow clip on root layer if HitTestRequest::IgnoreClipping is set.

Source/core/paint/DeprecatedPaintLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 550 matching lines @@
         const HitTestingTransformState* unflattenedTransformState, bool depthSortDescendants);
 
     PassRefPtr<HitTestingTransformState> createLocalTransformState(DeprecatedPaintLayer* rootLayer, DeprecatedPaintLayer* containerLayer,
         const LayoutRect& hitTestRect, const HitTestLocation&,
         const HitTestingTransformState* containerTransformState,
         const LayoutPoint& translationOffset = LayoutPoint()) const;
 
     bool hitTestContents(HitTestResult&, const LayoutRect& layerBounds, const HitTestLocation&, HitTestFilter) const;
     bool hitTestContentsForFragments(const DeprecatedPaintLayerFragments&, HitTestResult&, const HitTestLocation&, HitTestFilter, bool& insideClipRect) const;
     DeprecatedPaintLayer* hitTestTransformedLayerInFragments(DeprecatedPaintLayer* rootLayer, DeprecatedPaintLayer* containerLayer, HitTestResult&,
-        const LayoutRect& hitTestRect, const HitTestLocation&, const HitTestingTransformState* = 0, double* zOffset = 0);
+        const LayoutRect& hitTestRect, const HitTestLocation&, const HitTestingTransformState*, double* zOffset, ClipRectsCacheSlot);
 
     bool childBackgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const;
 
     bool shouldBeSelfPaintingLayer() const;
 
     // FIXME: We should only create the stacking node if needed.
     bool requiresStackingNode() const { return true; }
     void updateStackingNode();
 
     void updateReflectionInfo(const ComputedStyle*);
@@ skipping 128 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::DeprecatedPaintLayer*);
 void showLayerTree(const blink::LayoutObject*);
 #endif
 
 #endif // Layer_h