Add StyleDifference::needsVisualRectUpdate

third_party/WebKit/Source/core/style/ComputedStyle.cpp

Index: third_party/WebKit/Source/core/style/ComputedStyle.cpp
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.cpp b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
index 1a07e189c1ca942ee2389360984bf78d3f62f0f8..61288ef9b791d248934c354f8951c05146c7f9bf 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.cpp
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.cpp
@@ -561,12 +561,12 @@ StyleDifference ComputedStyle::visualInvalidationDiff(
   else if (diffNeedsPaintInvalidationObject(other))
     diff.setNeedsPaintInvalidationObject();
 
-  updatePropertySpecificDifferences(other, diff);
+  if (diffNeedsVisualRectUpdate(other))
+    diff.setNeedsVisualRectUpdate();
 
-  // The following condition needs to be at last, because it may depend on
-  // conditions in diff computed above.
-  if (scrollAnchorDisablingPropertyChanged(other, diff))
-    diff.setScrollAnchorDisablingPropertyChanged();
+  // This needs to be at last, because it may depend on conditions in diff
+  // computed above.
+  updatePropertySpecificDifferences(other, diff);
 
   // Cursors are not checked, since they will be set appropriately in response
   // to mouse events, so they don't need to cause any paint invalidation or
@@ -1004,6 +1004,21 @@ bool ComputedStyle::diffNeedsPaintInvalidationObjectForPaintImage(
   return false;
 }
 
+// This doesn't include conditions needing layout or overflow recomputation
+// which implies visual rect update.
+bool ComputedStyle::diffNeedsVisualRectUpdate(
+    const ComputedStyle& other) const {
+  // Visual rect is empty if visibility is hidden.
+  if (visibility() != other.visibility())
+    return true;
+
+  // Need to update visual rect of the resizer.
+  if (resize() != other.resize())
+    return true;
+
+  return false;
+}
+
 void ComputedStyle::updatePropertySpecificDifferences(
     const ComputedStyle& other,
     StyleDifference& diff) const {
@@ -1098,6 +1113,9 @@ void ComputedStyle::updatePropertySpecificDifferences(
   if (hasClip != otherHasClip ||
       (hasClip && m_visual->clip != other.m_visual->clip))
     diff.setCSSClipChanged();
+
+  if (scrollAnchorDisablingPropertyChanged(other, diff))
+    diff.setScrollAnchorDisablingPropertyChanged();
 }
 
 void ComputedStyle::addPaintImage(StyleImage* image) {