[SPv2] Use PassRefPtr in PropertyTreeState setter and remove meaningless DCHECK

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..6e47c464f62e593a1f6bf44103754c691c8e2b4e 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/PropertyTreeState.h
@@ -38,36 +38,30 @@ class PropertyTreeState {
     DCHECK(!m_transform || !m_transform->hasOneRef());
     return m_transform.get();
   }
-  void setTransform(const TransformPaintPropertyNode* node) {
+  void setTransform(PassRefPtr<const TransformPaintPropertyNode> node) {
     m_transform = node;
-    DCHECK(!node->hasOneRef());

[trchen, 2016/12/15 04:15:52]

Just realized this DCHECK makes no sense. The only way 'node' could have exactly
1 reference at this point is that m_transform.get() == node in the beginning.
Otherwise assigning to m_transform increases reference count by 1, and the
reference count should already be 1 or more in the beginning.

   }
 
   const ClipPaintPropertyNode* clip() const {
     DCHECK(!m_clip || !m_clip->hasOneRef());
     return m_clip.get();
   }
-  void setClip(const ClipPaintPropertyNode* node) {
-    m_clip = node;
-    DCHECK(!node->hasOneRef());
-  }
+  void setClip(PassRefPtr<const ClipPaintPropertyNode> node) { m_clip = node; }
 
   const EffectPaintPropertyNode* effect() const {
     DCHECK(!m_effect || !m_effect->hasOneRef());
     return m_effect.get();
   }
-  void setEffect(const EffectPaintPropertyNode* node) {
+  void setEffect(PassRefPtr<const EffectPaintPropertyNode> node) {
     m_effect = node;
-    DCHECK(!node->hasOneRef());
   }
 
   const ScrollPaintPropertyNode* scroll() const {
     DCHECK(!m_scroll || !m_scroll->hasOneRef());
     return m_scroll.get();
   }
-  void setScroll(const ScrollPaintPropertyNode* node) {
+  void setScroll(PassRefPtr<const ScrollPaintPropertyNode> node) {
     m_scroll = node;
-    DCHECK(!node->hasOneRef());
   }
 
  private: