[animation-worklet] move layout tests to new directory

Bug: 887659
Change-Id: I6b201d3eb3e75bbdc56429228d82e72830a96709
Reviewed-on: https://chromium-review.googlesource.com/c/1261981Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596706}

third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/worklet-animation-with-invalid-effect.html → third_party/WebKit/LayoutTests/animations/animationworklet/worklet-animation-with-invalid-effect.html

@@ -7,8 +7,8 @@
 </style>
 
 <div id="target"></div>
-<script src='../../../../resources/testharness.js'></script>
-<script src='../../../../resources/testharnessreport.js'></script>
+<script src='../../resources/testharness.js'></script>
+<script src='../../resources/testharnessreport.js'></script>
 
 <script>
 test(function() {