Backed out changeset 5c6cdeb8648d (bug 1355588) causing talos tart timeouts.

--HG--
extra : rebase_source : 238d706bb366772d4870493938deac41a271db6b

browser/base/content/browser.css

@@ -176,24 +176,6 @@ panelview[mainview] > .panel-header {
   min-width: calc(var(--tab-min-width) + 10px);
 }
 
-@supports -moz-bool-pref("browser.tabs.newanimations") {
-
-.tabbrowser-tab:not([pinned]):not([tabdrop-samewindow]) {
-  transition: transform 100ms ease-in-out;
-}
-
-#tabbrowser-tabs[movingtab] > .tabbrowser-tab[selected] {
-  transition: none;
-}
-
-.tabbrowser-tab:not([pinned]):not([fadein]) {
-  transform: translateY(var(--tab-min-height));
-}
-
-} /* end @supports -moz-bool-pref("browser.tabs.newanimations") */
-
-@supports not -moz-bool-pref("browser.tabs.newanimations") {
-
 .tabbrowser-tab:not([pinned]):not([fadein]) {
   max-width: 0.1px;
   min-width: 0.1px;
@@ -221,8 +203,6 @@ panelview[mainview] > .panel-header {
   display: none;
 }
 
-} /* end @supports not -moz-bool-pref("browser.tabs.newanimations") */
-
 %ifdef NIGHTLY_BUILD
 @supports -moz-bool-pref("browser.tabs.hideThrobber") {
   .tab-throbber {

browser/base/content/tabbrowser.xml

@@ -1234,19 +1234,11 @@
       ]]></handler>
 
       <handler event="transitionend"><![CDATA[
-        if (event.propertyName != "max-width" &&
-            event.propertyName != "transform") {
+        if (event.propertyName != "max-width") {
           return;
         }
 
-        if (gBrowser.tabAnimationsInProgress == 0) {
-          return;
-        }
-
-        let tab = event.originalTarget;
-        if (tab.nodeName != "tab") {
-          return;
-        }
+        var tab = event.target;
 
         if (tab.getAttribute("fadein") == "true") {
           if (tab._fullyOpen) {
@@ -1257,9 +1249,6 @@
         } else if (tab.closing) {
           gBrowser._endRemoveTab(tab);
         }
-
-        let evt = new CustomEvent("TabAnimationEnd", { bubbles: true });
-        tab.dispatchEvent(evt);
       ]]></handler>
 
       <handler event="dblclick"><![CDATA[

browser/base/content/test/general/browser_bug585785.js

@@ -23,10 +23,13 @@ function checkAnimationState() {
 
   info("tab didn't close immediately, so the tab opening animation must have started moving");
   info("waiting for the tab to close asynchronously");
-  tab.addEventListener("TabAnimationEnd", function listener() {
-    executeSoon(function() {
-      ok(!tab.parentNode, "tab removed asynchronously");
-      finish();
-    });
-  }, {once: true});
+  tab.addEventListener("transitionend", function listener(event) {
+    if (event.propertyName == "max-width") {
+      tab.removeEventListener("transitionend", listener);
+      executeSoon(function() {
+        ok(!tab.parentNode, "tab removed asynchronously");
+        finish();
+      });
+    }
+  });
 }

browser/base/content/test/performance/browser_tabclose.js

@@ -36,7 +36,8 @@ add_task(async function() {
   await withPerfObserver(async function() {
     let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
     gBrowser.removeTab(tab, { animate: true });
-    await BrowserTestUtils.waitForEvent(tab, "TabAnimationEnd");
+    await BrowserTestUtils.waitForEvent(tab, "transitionend",
+        false, e => e.propertyName === "max-width");
     await switchDone;
   }, {expectedReflows: EXPECTED_REFLOWS,
       frames: {

browser/base/content/test/performance/browser_tabclose_grow.js

@@ -45,7 +45,8 @@ add_task(async function() {
     let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
     let tab = gBrowser.tabs[gBrowser.tabs.length - 1];
     gBrowser.removeTab(tab, { animate: true, byMouse: true });
-    await BrowserTestUtils.waitForEvent(tab, "TabAnimationEnd");
+    await BrowserTestUtils.waitForEvent(tab, "transitionend",
+      false, e => e.propertyName === "max-width");
     await switchDone;
   }, {expectedReflows: EXPECTED_REFLOWS,
       frames: {

browser/base/content/test/performance/browser_tabopen.js

@@ -42,7 +42,8 @@ add_task(async function() {
   await withPerfObserver(async function() {
     let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
     BrowserOpenTab();
-    await BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "TabAnimationEnd");
+    await BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "transitionend",
+                                        false, e => e.propertyName === "max-width");
     await switchDone;
   }, {expectedReflows: EXPECTED_REFLOWS,
       frames: {

browser/base/content/test/performance/browser_tabopen_squeeze.js

@@ -40,7 +40,8 @@ add_task(async function() {
   await withPerfObserver(async function() {
     let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
     BrowserOpenTab();
-    await BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "TabAnimationEnd");
+    await BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "transitionend",
+      false, e => e.propertyName === "max-width");
     await switchDone;
   }, {expectedReflows: EXPECTED_REFLOWS,
       frames: {

browser/base/content/test/performance/browser_tabstrip_overflow_underflow.js

@@ -75,7 +75,8 @@ add_task(async function() {
   await withPerfObserver(async function() {
     let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
     BrowserOpenTab();
-    await BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "TabAnimationEnd");
+    await BrowserTestUtils.waitForEvent(gBrowser.selectedTab, "transitionend",
+        false, e => e.propertyName === "max-width");
     await switchDone;
     await BrowserTestUtils.waitForCondition(() => {
       return gBrowser.tabContainer.arrowScrollbox.hasAttribute("scrolledtoend");

testing/talos/talos/tests/tart/addon/content/tart.js

@@ -42,15 +42,15 @@ Tart.prototype = {
 
   tabDetector: {
     arm(handler, win) {
-      win.gBrowser.tabContainer.addEventListener("TabAnimationEnd", handler);
+      win.gBrowser.tabContainer.addEventListener("transitionend", handler);
     },
 
     measureNow(e) {
-      return (e.type == "TabAnimationEnd");
+      return (e.type == "transitionend" && e.propertyName == "max-width");
     },
 
     cleanup(handler, win) {
-      win.gBrowser.tabContainer.removeEventListener("TabAnimationEnd", handler);
+      win.gBrowser.tabContainer.removeEventListener("transitionend", handler);
     },
   },