Rewrite svg/dynamic-updates to use text-based repaint harness

LayoutTests/svg/animations/resources/SVGAnimationTestCase.js

 // Inspired by Layoutests/animations/animation-test-helpers.js
-// Modified to work with SVG and together with LayoutTests/svg/dynamic-updates/resources/SVGTestCase.js
 
 function isCloseEnough(actual, desired, tolerance) {
     var diff = Math.abs(actual - desired);
     return diff <= tolerance;
 }
 
 function shouldBeCloseEnough(_a, _b, tolerance) {
     if (typeof tolerance != "number")
       tolerance = 0.1 // Default
     if (typeof _a != "string" || typeof _b != "string")
@@ skipping 122 matching lines @@
     }
 
     // Pause animations, we'll drive them manually.
     rootSVGElement.pauseAnimations();
 
     if (window.testRunner)
         setTimeout(sampleAnimation, 0);
     else
         setTimeout(sampleAnimation, 50);
 }