Wait more time after performing actions to deflaky testActionsMouseDrag

Right now the chromedriver test testActionsMouseDrag is still flaky
after we wait 1 second for the page layout loading, we will wait 1
second after performing the actions to check what has been changed on
the page to avoid flakiness.

Bug: 1033382
Change-Id: Idc9d88326f253723ad619ae46fb6b7b014ecafe5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051576Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740835}

chrome/test/chromedriver/test/run_py_tests.py

@@ -901,6 +901,7 @@ class ChromeDriverTest(ChromeDriverBaseTestWithWebServer):
       'id': 'pointer1'}]})
     time.sleep(1)
     self._driver.PerformActions(actions)
+    time.sleep(1)
     rect = target.GetRect()
     self.assertEquals(150, rect['x'])
     self.assertEquals(200, rect['y'])
@@ -919,6 +920,7 @@ class ChromeDriverTest(ChromeDriverBaseTestWithWebServer):
       'id': 'pointer1'}]})
     time.sleep(1)
     self._driver.PerformActions(actions)
+    time.sleep(1)
     rect = target.GetRect()
     self.assertEquals(180, rect['x'])
     self.assertEquals(240, rect['y'])
@@ -939,6 +941,7 @@ class ChromeDriverTest(ChromeDriverBaseTestWithWebServer):
       'id': 'pointer1'}]})
     time.sleep(1)
     self._driver.PerformActions(actions)
+    time.sleep(1)
     rect = target.GetRect()
     self.assertEquals(180, rect['x'])
     self.assertEquals(240, rect['y'])