Web Animations: Update naming to reflect spec changes

LayoutTests/animations/resources/animation-test-helpers.js

 /* This is the helper script for animation tests:
 
 Test page requirements:
 - The body must contain an empty div with id "result"
 - Call this function directly from the <script> inside the test page
 
 runAnimationTest and runTransitionTest parameters:
     expected [required]: an array of arrays defining a set of CSS properties that must have given values at specific times (see below)
     callbacks [optional]: a function to be executed immediately after animation starts;
                           or, an object in the form {time: function} containing functions to be
@@ skipping 187 matching lines @@
 
     if (finished)
         endTest();
     else
         requestAnimationFrame(runChecksWithRAF.bind(null, checks));
 }
 
 function runChecksWithPauseAPI(checks) {
     for (var k in checks) {
         var timeMs = Number(k);
-        log('Pausing at time: ' + timeMs + ', current players: ' + document.timeline.getAnimationPlayers().length);
+        log('Pausing at time: ' + timeMs + ', current animations: ' + document.timeline.getAnimations().length);
         internals.pauseAnimations(timeMs / 1000);
         checks[k].forEach(function(check) { check(); });
     }
     endTest();
 }
 
 function startTest(checks)
 {
     if (hasPauseAnimationAPI)
         runChecksWithPauseAPI(checks);
@@ skipping 10 matching lines @@
 var animStartTime;
 var isTransitionsTest = false;
 
 function log(message)
 {
     logMessages.push(performance.now() + ' - ' + message);
 }
 
 function waitForAnimationsToStart(callback)
 {
-    if (document.timeline.getAnimationPlayers().length > 0) {
+    if (document.timeline.getAnimations().length > 0) {
         callback();
     } else {
         setTimeout(waitForAnimationsToStart.bind(this, callback), 0);
     }
 }
 
 // FIXME: disablePauseAnimationAPI and doPixelTest
 function runAnimationTest(expected, callbacks, trigger, disablePauseAnimationAPI, doPixelTest, startTestImmediately)
 {
     log('runAnimationTest');
@@ skipping 58 matching lines @@
         var target = isTransitionsTest ? window : document;
         var event = isTransitionsTest ? 'load' : 'webkitAnimationStart';
         target.addEventListener(event, begin, false);
     }
 }
 
 function runTransitionTest(expected, trigger, callbacks, doPixelTest, disablePauseAnimationAPI) {
     isTransitionsTest = true;
     runAnimationTest(expected, callbacks, trigger, disablePauseAnimationAPI, doPixelTest);
 }