Disable clipping on root scroller's ancestors.

third_party/WebKit/Source/core/paint/PaintLayer.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayer.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.cpp b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
index 9fa0a8e32d6fdd95aeccbb84c1e4ee9423d139bb..47d5a5242b24ab8fc06c51861a756f9a0bbaa4d0 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
@@ -161,6 +161,7 @@ PaintLayer::PaintLayer(LayoutBoxModelObject* layoutObject)
     , m_hasDescendantWithClipPath(false)
     , m_hasNonIsolatedDescendantWithBlendMode(false)
     , m_hasAncestorWithClipPath(false)
+    , m_hasRootScrollerAsDescendant(false)
     , m_layoutObject(layoutObject)
     , m_parent(0)
     , m_previous(0)
@@ -977,10 +978,11 @@ void PaintLayer::updateAncestorDependentCompositingInputs(const AncestorDependen
     m_needsAncestorDependentCompositingInputsUpdate = false;
 }
 
-void PaintLayer::updateDescendantDependentCompositingInputs(bool hasDescendantWithClipPath, bool hasNonIsolatedDescendantWithBlendMode)
+void PaintLayer::updateDescendantDependentCompositingInputs(bool hasDescendantWithClipPath, bool hasNonIsolatedDescendantWithBlendMode, bool hasRootScrollerAsDescendant)
 {
     m_hasDescendantWithClipPath = hasDescendantWithClipPath;
     m_hasNonIsolatedDescendantWithBlendMode = hasNonIsolatedDescendantWithBlendMode;
+    m_hasRootScrollerAsDescendant = hasRootScrollerAsDescendant;
     m_needsDescendantDependentCompositingInputsUpdate = false;
 }