Force subtree paint property updates on local border box changes

third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h

Index: third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h b/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
index 0204844235482c817b3b3089078fd63d1a110951..6c96366ee0791e2556e9b55a514060a071d7fa25 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
@@ -15,9 +15,7 @@
 namespace blink {
 
 // A complete set of paint properties including those that are inherited from
-// other objects.  RefPtrs are used to guard against use-after-free bugs and
-// DCHECKs ensure PropertyTreeState never retains the last reference to a
-// property tree node.
+// other objects. RefPtrs are only used to guard against use-after-free bugs.
 class PropertyTreeState {
  public:
   PropertyTreeState(const TransformPaintPropertyNode* transform,
@@ -35,7 +33,6 @@ class PropertyTreeState {
   }
 
   const TransformPaintPropertyNode* transform() const {
-    DCHECK(!m_transform || !m_transform->hasOneRef());
     return m_transform.get();
   }
   void setTransform(const TransformPaintPropertyNode* node) {
@@ -44,7 +41,6 @@ class PropertyTreeState {
   }
 
   const ClipPaintPropertyNode* clip() const {
-    DCHECK(!m_clip || !m_clip->hasOneRef());
     return m_clip.get();
   }
   void setClip(const ClipPaintPropertyNode* node) {
@@ -53,7 +49,6 @@ class PropertyTreeState {
   }
 
   const EffectPaintPropertyNode* effect() const {
-    DCHECK(!m_effect || !m_effect->hasOneRef());
     return m_effect.get();
   }
   void setEffect(const EffectPaintPropertyNode* node) {
@@ -62,7 +57,6 @@ class PropertyTreeState {
   }
 
   const ScrollPaintPropertyNode* scroll() const {
-    DCHECK(!m_scroll || !m_scroll->hasOneRef());
     return m_scroll.get();
   }
   void setScroll(const ScrollPaintPropertyNode* node) {