Devtools Animations: Don't wait for empty transitions to start

third_party/WebKit/LayoutTests/inspector-protocol/animation/animation-create-cancel.html

Index: third_party/WebKit/LayoutTests/inspector-protocol/animation/animation-create-cancel.html
diff --git a/third_party/WebKit/LayoutTests/inspector-protocol/animation/animation-create-cancel.html b/third_party/WebKit/LayoutTests/inspector-protocol/animation/animation-create-cancel.html
index de25fc5a11e9c023738fbb58d3cd490db2c25481..58e6cc01aa16812f7a8f3ecdf4cb42bc287a11b7 100644
--- a/third_party/WebKit/LayoutTests/inspector-protocol/animation/animation-create-cancel.html
+++ b/third_party/WebKit/LayoutTests/inspector-protocol/animation/animation-create-cancel.html
@@ -15,10 +15,10 @@ function cancelAnimation()
     player.cancel();
 }
 
-
 function test()
 {
     InspectorTest.eventHandler["Animation.animationCreated"] = onCreated;
+    InspectorTest.eventHandler["Animation.animationCancelled"] = onCancelled;
     InspectorTest.eventHandler["Animation.animationStarted"] = onStarted;
     InspectorTest.sendCommand("Animation.enable", {});
     InspectorTest.evaluateInPage("startAnimation()", function() {});
@@ -31,6 +31,12 @@ function test()
     function onStarted()
     {
         InspectorTest.log("Animation started");
+        InspectorTest.evaluateInPage("cancelAnimation()", function() {});
+    }
+
+    function onCancelled()
+    {
+        InspectorTest.log("Animation cancelled");
         InspectorTest.completeTest();
     }
 }