Throw TypeError if easing string is invalid.

third_party/WebKit/Source/core/animation/AnimationEffectTiming.cpp

Index: third_party/WebKit/Source/core/animation/AnimationEffectTiming.cpp
diff --git a/third_party/WebKit/Source/core/animation/AnimationEffectTiming.cpp b/third_party/WebKit/Source/core/animation/AnimationEffectTiming.cpp
index 55f811107c4b679502d647b3629b9eeacd35a519..a7b9992a06d798b95451b95a2c6d0208d4e990ea 100644
--- a/third_party/WebKit/Source/core/animation/AnimationEffectTiming.cpp
+++ b/third_party/WebKit/Source/core/animation/AnimationEffectTiming.cpp
@@ -4,6 +4,7 @@
 
 #include "core/animation/AnimationEffectTiming.h"
 
+#include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/UnionTypesCore.h"
 #include "core/animation/AnimationEffect.h"
 #include "core/animation/KeyframeEffect.h"
@@ -127,11 +128,11 @@ void AnimationEffectTiming::setDirection(String direction)
     m_parent->updateSpecifiedTiming(timing);
 }
 
-void AnimationEffectTiming::setEasing(String easing)
+void AnimationEffectTiming::setEasing(String easing, ExceptionState& exceptionState)
 {
     Timing timing = m_parent->specifiedTiming();
-    TimingInput::setTimingFunction(timing, easing);
-    m_parent->updateSpecifiedTiming(timing);
+    if (TimingInput::setTimingFunction(timing, easing, exceptionState))
+        m_parent->updateSpecifiedTiming(timing);
 }
 
 DEFINE_TRACE(AnimationEffectTiming)