Check subtree paint invalidation when overflow clip status changes

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 1e84756575c119035d72b499d4134428c7249fc2..8e032c35361cf0478df38644ec914f9f9f7ebe4a 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -1361,6 +1361,9 @@ public:
     bool mayNeedPaintInvalidation() const { return m_bitfields.mayNeedPaintInvalidation(); }
     void setMayNeedPaintInvalidation();
 
+    bool mayNeedPaintInvalidationSubtree() const { return m_bitfields.mayNeedPaintInvalidationSubtree(); }
+    void setMayNeedPaintInvalidationSubtree();
+
     bool shouldInvalidateSelection() const { return m_bitfields.shouldInvalidateSelection(); }
     void setShouldInvalidateSelection();
 
@@ -1722,6 +1725,7 @@ private:
             , m_shouldInvalidateOverflowForPaint(false)
             , m_childShouldCheckForPaintInvalidation(false)
             , m_mayNeedPaintInvalidation(false)
+            , m_mayNeedPaintInvalidationSubtree(false)
             , m_shouldInvalidateSelection(false)
             , m_neededLayoutBecauseOfChildren(false)
             , m_floating(false)
@@ -1757,7 +1761,7 @@ private:
         {
         }
 
-        // 32 bits have been used in the first word, and 17 in the second.
+        // 32 bits have been used in the first word, and 18 in the second.
 
         // Self needs layout means that this layout object is marked for a full layout.
         // This is the default layout but it is expensive as it recomputes everything.
@@ -1808,6 +1812,7 @@ private:
         ADD_BOOLEAN_BITFIELD(shouldInvalidateOverflowForPaint, ShouldInvalidateOverflowForPaint); // TODO(wangxianzhu): Remove for slimming paint v2.
         ADD_BOOLEAN_BITFIELD(childShouldCheckForPaintInvalidation, ChildShouldCheckForPaintInvalidation);
         ADD_BOOLEAN_BITFIELD(mayNeedPaintInvalidation, MayNeedPaintInvalidation);
+        ADD_BOOLEAN_BITFIELD(mayNeedPaintInvalidationSubtree, MayNeedPaintInvalidationSubtree);
         ADD_BOOLEAN_BITFIELD(shouldInvalidateSelection, ShouldInvalidateSelection); // TODO(wangxianzhu): Remove for slimming paint v2.
         ADD_BOOLEAN_BITFIELD(neededLayoutBecauseOfChildren, NeededLayoutBecauseOfChildren); // TODO(wangxianzhu): Remove for slimming paint v2.