Disable flaky EventGeneratorTest.MouseEventsProcessedSequentially.

I looked at other js-based tests and couldn't find a way to disable only
on a single platform (it seems that the flakiness is specific to
ChromeOS).

Note that most of the changes in this CL comes from
|git cl format --js chrome/browser/resources|.

Bug: 1136991
Change-Id: Ib292732483b5f1d88f0a5b919c66eb484646f31b
Tbr: anastasi@chromium.org
Tbr: dtseng@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463928Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815866}

chrome/browser/resources/chromeos/accessibility/common/event_generator_test.js

@@ -10,34 +10,39 @@ GEN_INCLUDE([
 /** Test fixture for array_util.js. */
 EventGeneratorTest = class extends ChromeVoxNextE2ETest {};
 
-TEST_F('EventGeneratorTest', 'MouseEventsProcessedSequentially', function() {
-  const mouseEventLog = [];
-  chrome.accessibilityPrivate.sendSyntheticMouseEvent = (event) =>
-      mouseEventLog.push(event);
+// Fails on ChromeOS - https://crbug.com/1136991
+TEST_F(
+    'EventGeneratorTest', 'DISABLED_MouseEventsProcessedSequentially',
+    function() {
+      const mouseEventLog = [];
+      chrome.accessibilityPrivate.sendSyntheticMouseEvent = (event) =>
+          mouseEventLog.push(event);
 
-  // Set a 1ms delay so that a timeout is set between the press and release.
-  EventGenerator.sendMouseClick(100, 100, /*delayMs=*/ 1);
-  assertEquals(1, mouseEventLog.length, 'First event should be synchronous');
+      // Set a 1ms delay so that a timeout is set between the press and release.
+      EventGenerator.sendMouseClick(100, 100, /*delayMs=*/ 1);
+      assertEquals(
+          1, mouseEventLog.length, 'First event should be synchronous');
 
-  EventGenerator.sendMouseClick(200, 200, /*delayMs=*/ 1);
-  assertEquals(
-      1, mouseEventLog.length,
-      'Second mouse click shouldn\'t start until first has finished');
+      EventGenerator.sendMouseClick(200, 200, /*delayMs=*/ 1);
+      assertEquals(
+          1, mouseEventLog.length,
+          'Second mouse click shouldn\'t start until first has finished');
 
-  const checkEventLog = () => {
-    assertEquals(
-        4, mouseEventLog.length, 'Both click events should have completed.');
-    assertEquals('press', mouseEventLog[0].type);
-    assertEquals('release', mouseEventLog[1].type);
-    assertEquals(mouseEventLog[0].x, mouseEventLog[1].x);
-    assertEquals(mouseEventLog[0].y, mouseEventLog[1].y);
+      const checkEventLog = () => {
+        assertEquals(
+            4, mouseEventLog.length,
+            'Both click events should have completed.');
+        assertEquals('press', mouseEventLog[0].type);
+        assertEquals('release', mouseEventLog[1].type);
+        assertEquals(mouseEventLog[0].x, mouseEventLog[1].x);
+        assertEquals(mouseEventLog[0].y, mouseEventLog[1].y);
 
-    assertEquals('press', mouseEventLog[2].type);
-    assertEquals('release', mouseEventLog[3].type);
-    assertEquals(mouseEventLog[2].x, mouseEventLog[3].x);
-    assertEquals(mouseEventLog[2].y, mouseEventLog[3].y);
-  };
-  // Experimentally, the code takes 13ms to set all timeouts on a development
-  // machine. Wait 150ms to increase stability.
-  setTimeout(this.newCallback(checkEventLog), 150);
-});
+        assertEquals('press', mouseEventLog[2].type);
+        assertEquals('release', mouseEventLog[3].type);
+        assertEquals(mouseEventLog[2].x, mouseEventLog[3].x);
+        assertEquals(mouseEventLog[2].y, mouseEventLog[3].y);
+      };
+      // Experimentally, the code takes 13ms to set all timeouts on a
+      // development machine. Wait 150ms to increase stability.
+      setTimeout(this.newCallback(checkEventLog), 150);
+    });