Set overflowControlsHost layer bounds.

Source/core/rendering/RenderLayerCompositor.cpp

Index: Source/core/rendering/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/RenderLayerCompositor.cpp b/Source/core/rendering/RenderLayerCompositor.cpp
index 9a2f22bd0b135fdf9a775c82a38b7cdbf21340ab..17826f6483379206397847e7f89ae1304c78290f 100644
--- a/Source/core/rendering/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/RenderLayerCompositor.cpp
@@ -1129,8 +1129,8 @@ void RenderLayerCompositor::frameViewDidChangeLocation(const IntPoint& contentsO
 
 void RenderLayerCompositor::frameViewDidChangeSize()
 {
+    FrameView* frameView = m_renderView->frameView();
     if (m_containerLayer) {
-        FrameView* frameView = m_renderView->frameView();
         m_containerLayer->setSize(frameView->unscaledVisibleContentSize());
 
         frameViewDidScroll();
@@ -1141,6 +1141,8 @@ void RenderLayerCompositor::frameViewDidChangeSize()
             m_layerForOverhangAreas->setSize(frameView->frameRect().size());
 #endif
     }
+    if (m_overflowControlsHostLayer)
+        m_overflowControlsHostLayer->setSize(frameView->unscaledVisibleContentSize(ScrollableArea::IncludeScrollbars));
 }
 
 void RenderLayerCompositor::frameViewDidScroll()
@@ -1488,10 +1490,11 @@ void RenderLayerCompositor::updateRootLayerPosition()
         m_rootContentLayer->setSize(documentRect.size());
         m_rootContentLayer->setPosition(documentRect.location());
     }
-    if (m_containerLayer) {
-        FrameView* frameView = m_renderView->frameView();
+    FrameView* frameView = m_renderView->frameView();
+    if (m_containerLayer)
         m_containerLayer->setSize(frameView->unscaledVisibleContentSize());
-    }
+    if (m_overflowControlsHostLayer)
+        m_overflowControlsHostLayer->setSize(frameView->unscaledVisibleContentSize(ScrollableArea::IncludeScrollbars));
 
 #if ENABLE(RUBBER_BANDING)
     if (m_contentShadowLayer) {