Bug 1261561 - Part 1: Fix TimeScale.getAnimationDimensions() to handle multiple iterations. r=pbro

MozReview-Commit-ID: FUjebmapYH1

--HG--
extra : rebase_source : 5f54bc420da55d5f66c684bb75f7e0be7fb810ad

devtools/client/animationinspector/utils.js

@@ -328,7 +328,8 @@ var TimeScale = {
     // The width of the endDelay.
     let endDelayW = this.durationToDistance(Math.abs(endDelay) / rate);
     // The start position of the endDelay.
-    let endDelayX = endDelay < 0 ? x + w - endDelayW : x + w;
+    let endDelayX = endDelay < 0 ? x + iterationW - endDelayW
+                                 : x + iterationW;
 
     return {x, w, iterationW, delayX, delayW, negativeDelayW,
             endDelayX, endDelayW};