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

third_party/WebKit/Source/core/page/scrolling/TopDocumentRootScrollerController.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/page/scrolling/TopDocumentRootScrollerController.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
@@ skipping 48 matching lines @@
     // doesn't have a scrolling/clip layer, its PLC has a container layer that
     // needs to be resized instead.
     layer->compositor()->frameViewDidChangeSize();
   }
 }
 
 ScrollableArea* TopDocumentRootScrollerController::rootScrollerArea() const {
   return RootScrollerUtil::scrollableAreaForRootScroller(globalRootScroller());
 }
 
-IntSize TopDocumentRootScrollerController::rootScrollerVisibleArea() const {
+IntRect TopDocumentRootScrollerController::visibleContentRect(
+    IncludeScrollbarsInRect includeScrollbars) const {
   if (!topDocument() || !topDocument()->view())
-    return IntSize();
+    return IntRect();
 
   float minimumPageScale =
       m_frameHost->pageScaleConstraintsSet().finalConstraints().minimumScale;
   int browserControlsAdjustment =
       ceilf(m_frameHost->visualViewport().browserControlsAdjustment() /
             minimumPageScale);
 
-  return topDocument()->view()->visibleContentSize(ExcludeScrollbars) +
-         IntSize(0, browserControlsAdjustment);
+  IntRect rect = topDocument()->view()->visibleContentRect(includeScrollbars);
+  rect.expand(0, browserControlsAdjustment);
+
+  return rect;
+}
+
+bool TopDocumentRootScrollerController::isRootScrollerAncestor(
+    const Node& node) const {
+  Node* curNode = globalRootScroller();
+
+  while (curNode) {
+    if (node.isSameNode(curNode))
+      return true;
+
+    // TODO(bokan): This won't work for OOPIF. crbug.com/642378.
+    if (curNode->isDocumentNode())
+      curNode = toDocument(curNode)->localOwner();
+    else
+      curNode = curNode->parentNode();
+  }
+
+  return false;
 }
 
 Element* TopDocumentRootScrollerController::findGlobalRootScrollerElement() {
   if (!topDocument())
     return nullptr;
 
   Node* effectiveRootScroller =
       &topDocument()->rootScrollerController().effectiveRootScroller();
 
   if (effectiveRootScroller->isDocumentNode())
@@ skipping 166 matching lines @@
 
 PaintLayer* TopDocumentRootScrollerController::rootScrollerPaintLayer() const {
   return RootScrollerUtil::paintLayerForRootScroller(m_globalRootScroller);
 }
 
 Element* TopDocumentRootScrollerController::globalRootScroller() const {
   return m_globalRootScroller.get();
 }
 
 }  // namespace blink