Fix mouse-events/mousemove-between.html on WebKit Linux MSAN

WPT test uievents/order-of-events/mouse-events/mousemove-between.html
timeout on WebKit Linux MSAN, because the mouse actions are generated
and sent too fast that some mouse moves maybe coalesced, so we missed
some mouse events. I added "pause" action for each mouse move, so that
we will handle each individual mouse move, so we will get the correct
mouse action sequence.


Bug: 1182532
Change-Id: I29e1d4832e9eb5b1ffb362d7c5e7475d1e34faf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2731228
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#859834}

third_party/blink/web_tests/MSANExpectations

@@ -167,6 +167,3 @@ crbug.com/1177358 [ Linux ] http/tests/devtools/console/console-viewport-stick-t
 crbug.com/1179829 [ Linux ] http/tests/devtools/a11y-axe-core/sources/scope-pane-a11y-test.js [ Pass Timeout ]
 crbug.com/1179829 [ Linux ] http/tests/devtools/console/console-log-linkify-stack-in-errors.js [ Pass Timeout ]
 crbug.com/1179829 [ Linux ] http/tests/devtools/sources/debugger-pause/pause-on-elements-panel.js [ Pass Timeout ]
-
-# Sheriff 2021-03-03
-crbug.com/1182532 [ Linux ] external/wpt/uievents/order-of-events/mouse-events/mousemove-between.html [ Pass Timeout ]

third_party/blink/web_tests/external/wpt/uievents/order-of-events/mouse-events/mousemove-between.html

@@ -115,11 +115,17 @@
   // Inject mouse inputs.
   await new test_driver.Actions()
       .pointerMove(b_rect.right + 10, center_b_y)
+      .pause(50)
       .pointerMove(0, 0, {origin: b})
+      .pause(50)
       .pointerMove(b_rect.right + 10, center_b_y)
+      .pause(50)
       .pointerMove(a_rect.right + 10, center_b_y)
+      .pause(50)
       .pointerMove(c_rect.right + 10, center_c_y)
+      .pause(50)
       .pointerMove(0, 0, {origin: c})
+      .pause(50)
       .pointerMove(c_rect.right + 20, c_rect.bottom + 20)
       .send();
 };