Move animation svg tests to own subdirectory

third_party/WebKit/LayoutTests/animations/svg/clear-svg-animation-effects.html

-<script src="../resources/testharness.js"></script>
-<script src="../resources/testharnessreport.js"></script>
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
 <svg>
   <stop id="target" offset="1"/>
 </svg>
 <script>
 var asyncHandle = async_test('SVG Attributes should return to their base values after animations have stopped applying.');
 
 var animation = target.animate([
   {'svg-offset': '0'},
   {'svg-offset': '0.5'},
 ], 1000);
 animation.pause();
 animation.currentTime = 500;
 
 requestAnimationFrame(() => {
   asyncHandle.step(() => {
     assert_equals(target.offset.animVal, 0.25, 'Animation is in effect.');
   });
   animation.cancel();
   requestAnimationFrame(() => {
     asyncHandle.step(() => {
       assert_equals(target.offset.animVal, 1, 'Animation is no longer in effect.');
     });
     asyncHandle.done();
   });
 });
 </script>