Early-out from the prepaint tree walk

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 bd0ba94ac49d929f860c99b9eaa2e8d88e60a75e..64396778858193a6e7e58400067e306386a1cabd 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -1702,6 +1702,9 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
     void setNeedsPaintPropertyUpdate() {
       m_layoutObject.setNeedsPaintPropertyUpdate();
     }
+    void setNeedsPaintPropertyUpdateWithoutMarkingAncestors() {
+      m_layoutObject.setNeedsPaintPropertyUpdateWithoutMarkingAncestors();
+    }
     void clearNeedsPaintPropertyUpdate() {
       m_layoutObject.clearNeedsPaintPropertyUpdate();
     }
@@ -1741,6 +1744,12 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
   // descendant needs an update too. This bit is up the tree, crossing frames,
   // when calling |setNeedsPaintPropertyUpdate|.
   void setNeedsPaintPropertyUpdate();
+  // Same as |setNeedsPaintPropertyUpdate| but does not notify ancestors as
+  // having a descendant needing a paint property update.
+  void setNeedsPaintPropertyUpdateWithoutMarkingAncestors() {
+    DCHECK_EQ(document().lifecycle().state(), DocumentLifecycle::InPrePaint);
+    m_bitfields.setNeedsPaintPropertyUpdate(true);
+  }
   bool needsPaintPropertyUpdate() const {
     return m_bitfields.needsPaintPropertyUpdate();
   }
@@ -1748,6 +1757,8 @@ class CORE_EXPORT LayoutObject : public ImageResourceObserver,
     DCHECK_EQ(document().lifecycle().state(), DocumentLifecycle::InPrePaint);
     m_bitfields.setNeedsPaintPropertyUpdate(false);
   }
+  // Sets |descendantNeedsPaintPropertyUpdate| on this object and all ancestors.
+  void setDescendantNeedsPaintPropertyUpdate();
   bool descendantNeedsPaintPropertyUpdate() const {
     return m_bitfields.descendantNeedsPaintPropertyUpdate();
   }