Bug 1371450 - Crash test. r=emilio

The crash test causes a panic in Servo_ResolveStyle on debug build without this patch series. The reason why we send mouse move event twice is that one for E10S and the other one is for non-E10S. It seems to be caused by being requestIdleCallback processed on different timing. MozReview-Commit-ID: 7cBmwhE9HDk --HG-- extra : rebase_source : a74aa277e2b161b1e4f8da27293cf89ddc3821e1
2017-07-15 13:16:15 +09:00 · 2017-07-15 13:16:15 +09:00 · a4f183c102
--- a/layout/style/crashtests/1371450-1.html
+++ b/layout/style/crashtests/1371450-1.html
@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title></title>
+<style>
+@keyframes anim {
+  to { transform: rotate(360deg); }
+}
+#animation {
+  animation: anim 3s infinite;
+}
+.red {
+  color: red;
+}
+</style>
+<div><span id="target">text</span></div>
+<div id="animation">animation</div>
+<script>
+window.addEventListener('load', () => {
+  var target = document.getElementById('target');
+  target.classList.add('red');
+  requestIdleCallback(() => {
+    target.classList.remove('red');
+    SpecialPowers.getDOMWindowUtils(window)
+                 .sendMouseEvent("mousemove", 100, 100, 1,
+                                 0, 1, 0);
+    requestIdleCallback(() => {
+      document.documentElement.classList.remove("reftest-wait");
+    });
+  });
+  SpecialPowers.getDOMWindowUtils(window)
+               .sendMouseEvent("mousemove", 100, 100, 1,
+                               0, 1, 0);
+});
+</script>
--- a/layout/style/crashtests/crashtests.list
+++ b/layout/style/crashtests/crashtests.list
@ -171,6 +171,7 @@ pref(dom.animations-api.core.enabled,true) load 1340344.html
 load 1342316-1.html
 load 1356601-1.html
 load 1370793-1.xhtml
+load 1371450-1.html
 load 1374175-1.html
 load content-only-on-link-before.html
 load content-only-on-visited-before.html