Implement AnimationEffectTimingReadOnly interface

third_party/WebKit/Source/core/inspector/InspectorAnimationAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorAnimationAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorAnimationAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorAnimationAgent.cpp
index b754a05d09eca94f5fd8645507941b82d1111e4e..03d1ff960a67b0077cbcc26c4e012ec14a835933 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorAnimationAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorAnimationAgent.cpp
@@ -382,12 +382,13 @@ void InspectorAnimationAgent::setTiming(ErrorString* errorString,
     newFrames[1]->setOffset(delay / (delay + duration));
     model->setFrames(newFrames);
 
-    AnimationEffectTiming* timing = animation->effect()->timing();
+    AnimationEffectTiming* timing = effect->timing();
     UnrestrictedDoubleOrString unrestrictedDuration;
     unrestrictedDuration.setUnrestrictedDouble(duration + delay);
     timing->setDuration(unrestrictedDuration, exceptionState);
   } else {
-    AnimationEffectTiming* timing = animation->effect()->timing();
+    AnimationEffectTiming* timing =
+        toAnimationEffectTiming(animation->effect()->timing());
     UnrestrictedDoubleOrString unrestrictedDuration;
     unrestrictedDuration.setUnrestrictedDouble(duration);
     timing->setDuration(unrestrictedDuration, exceptionState);