Check subtree paint invalidation when overflow clip status changes

third_party/WebKit/Source/core/layout/LayoutObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index b8823828a5cfdcaad8b691188080c8771f07d703..4ce682b8f536910b800f8f3020ec3c35ed57639b 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -1314,9 +1314,9 @@ void LayoutObject::invalidateTreeIfNeeded(const PaintInvalidationState& paintInv
 
     PaintInvalidationState newPaintInvalidationState(paintInvalidationState, *this);
     PaintInvalidationReason reason = invalidatePaintIfNeeded(newPaintInvalidationState);
-    clearPaintInvalidationFlags(newPaintInvalidationState);
 
     newPaintInvalidationState.updateForChildren(reason);
+    clearPaintInvalidationFlags(newPaintInvalidationState);
     invalidatePaintOfSubtreesIfNeeded(newPaintInvalidationState);
 }
 
@@ -3454,6 +3454,14 @@ void LayoutObject::setMayNeedPaintInvalidation()
     frameView()->scheduleVisualUpdateForPaintInvalidationIfNeeded();
 }
 
+void LayoutObject::setMayNeedPaintInvalidationSubtree()
+{
+    if (mayNeedPaintInvalidationSubtree())
+        return;
+    m_bitfields.setMayNeedPaintInvalidationSubtree(true);
+    setMayNeedPaintInvalidation();
+}
+
 void LayoutObject::clearPaintInvalidationFlags(const PaintInvalidationState& paintInvalidationState)
 {
     // paintInvalidationStateIsDirty should be kept in sync with the
@@ -3464,6 +3472,7 @@ void LayoutObject::clearPaintInvalidationFlags(const PaintInvalidationState& pai
     m_bitfields.setNeededLayoutBecauseOfChildren(false);
     m_bitfields.setShouldInvalidateOverflowForPaint(false);
     m_bitfields.setMayNeedPaintInvalidation(false);
+    m_bitfields.setMayNeedPaintInvalidationSubtree(false);
     m_bitfields.setShouldInvalidateSelection(false);
 }