Lock animated property type of result animation during processing

third_party/WebKit/Source/core/svg/animation/SVGSMILElement.h

Index: third_party/WebKit/Source/core/svg/animation/SVGSMILElement.h
diff --git a/third_party/WebKit/Source/core/svg/animation/SVGSMILElement.h b/third_party/WebKit/Source/core/svg/animation/SVGSMILElement.h
index fb1e6ff7a63a7b71f1fa302dab5932c694bb5bee..16d7b7b017f521ea57c2a1a4f90471e3c6a97885 100644
--- a/third_party/WebKit/Source/core/svg/animation/SVGSMILElement.h
+++ b/third_party/WebKit/Source/core/svg/animation/SVGSMILElement.h
@@ -112,6 +112,10 @@ public:
     virtual void clearAnimatedType() = 0;
     virtual void applyResultsToTarget() = 0;
 
+    bool animatedTypeIsLocked() const { return m_animatedPropertyLocked; }
+    void lockAnimatedType() { DCHECK(!m_animatedPropertyLocked); m_animatedPropertyLocked = true; }
+    void unlockAnimatedType() { DCHECK(m_animatedPropertyLocked); m_animatedPropertyLocked = false; }
+
     void connectSyncBaseConditions();
     void connectEventBaseConditions();
 
@@ -277,6 +281,8 @@ private:
     mutable SMILTime m_cachedMin;
     mutable SMILTime m_cachedMax;
 
+    bool m_animatedPropertyLocked;
+
     friend class ConditionEventListener;
 };