Expand PaintLayer clip to account for hidden URL bar with document.rootScroller

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
index e84890844671dbaf9726b46c093f3c94278d9702..33cdde0f4b7acc850813ae9d7425a26abcc9911b 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
@@ -1307,16 +1307,6 @@ void CompositedLayerMapping::updateScrollingLayerGeometry(
   IntRect overflowClipRect =
       pixelSnappedIntRect(layoutBox->overflowClipRect(LayoutPoint()));
 
-  const TopDocumentRootScrollerController& globalRootScrollerController =
-      layoutBox->document().frameHost()->globalRootScrollerController();
-
-  if (&m_owningLayer == globalRootScrollerController.rootScrollerPaintLayer()) {
-    LayoutRect clipRect =
-        layoutBox->document().layoutView()->overflowClipRect(LayoutPoint());

[chrishtr, 2017/01/21 02:06:47]

Why can this now be removed?

-    DCHECK(clipRect.size() == LayoutSize(pixelSnappedIntRect(clipRect).size()));
-    overflowClipRect.setSize(pixelSnappedIntRect(clipRect).size());
-  }
-
   // When a m_childTransformLayer exists, local content offsets for the
   // m_scrollingLayer have already been applied. Otherwise, we apply them here.
   IntSize localContentOffset(0, 0);