Add a fail-fast for longtask layouttests

This CL adds checks to fail tests for browsers that do not support longtasks
instead of forcing them to timeout.

Change-Id: I5be54a1ab0a5d003decb58fc1e79380cbce15976
Reviewed-on: https://chromium-review.googlesource.com/1128174Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573900}

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-attributes.html

@@ -10,6 +10,10 @@
 <div id="log"></div>
 <script>
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const observer = new PerformanceObserver(
         t.step_func(function (entryList) {
             const entries = entryList.getEntries();

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-childiframe-crossorigin.html

@@ -10,6 +10,10 @@
 <div id="log"></div>
 <script>
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const observer = new PerformanceObserver(
         t.step_func(function (entryList) {
             const entries = entryList.getEntries();

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-childiframe.html

@@ -11,6 +11,10 @@
 <script>
   const initialTime = performance.now();
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const observer = new PerformanceObserver(
         t.step_func(function (entryList) {
             const entries = entryList.getEntries();

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-externalscript.html

@@ -11,6 +11,10 @@
 <div id="log"></div>
 <script>
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const observer = new PerformanceObserver(
         t.step_func(function (entryList) {
             const entries = entryList.getEntries();

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-parentiframe.html

@@ -8,6 +8,10 @@
 
 <script>
   const t = async_test(t => {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     window.addEventListener('message', t.step_func(e => {
       assert_equals(e.data['entryType'], 'longtask');
       assert_equals(e.data['frame-attribution'], 'same-origin-ancestor');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-raf.html

@@ -11,6 +11,10 @@
 <div id="log"></div>
 <script>
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const observer = new PerformanceObserver(
         t.step_func(function (entryList) {
             const entries = entryList.getEntries();

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-sibling-iframe-crossorigin.html

@@ -8,6 +8,10 @@
 
 <script>
   async_test(t => {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     window.addEventListener('message', t.step_func(e => {
       assert_equals(e.data['entryType'], 'longtask');
       assert_equals(e.data['frame-attribution'], 'cross-origin-unreachable');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-in-sibling-iframe.html

@@ -8,6 +8,10 @@
 
 <script>
   async_test(t => {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     window.addEventListener('message', t.step_func(e => {
       assert_equals(e.data['entryType'], 'longtask');
       assert_equals(e.data['frame-attribution'], 'same-origin');

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/longtask-tojson.html

@@ -7,6 +7,10 @@
 <body>
 <script>
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const observer = new PerformanceObserver(
       t.step_func(function (entryList) {
         const entries = entryList.getEntries();

third_party/WebKit/LayoutTests/external/wpt/longtask-timing/shared-renderer/longtask-in-new-window.html

@@ -11,6 +11,10 @@
   This window opens a new window which contains a longtask. We test that the
   longtask from the new window is not observed by the observer of this window. */
 async_test(t => {
+  if (typeof PerformanceLongTaskTiming === 'undefined') {
+      assert_unreached("Longtasks are not supported.");
+      t.done();
+  }
   const observer = new PerformanceObserver(
       t.step_func(function (entryList) {
           const entries = entryList.getEntries();

third_party/WebKit/LayoutTests/http/tests/performance-timing/longtask-v2/longtask-executescript.html

@@ -10,6 +10,10 @@
 <div id="log"></div>
 <script>
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const scriptURL = 'longtask-executescript.html';
     const observer = new PerformanceObserver(
       t.step_func(function (entryList) {

third_party/WebKit/LayoutTests/http/tests/performance-timing/longtask-v2/longtask-v8compile.html

@@ -10,6 +10,10 @@
 <div id="log"></div>
 <script>
   async_test(function (t) {
+    if (typeof PerformanceLongTaskTiming === 'undefined') {
+        assert_unreached("Longtasks are not supported.");
+        t.done();
+    }
     const scriptURL = 'resources/makelongtask.js';
     const lineColumn = '(0, 0)';
     const observer = new PerformanceObserver(