Mark ChromeDriverTestWithCustomCapability.testEagerMode flaky on Mac

Bug: 1025967
Tbr: johnchen@chromium.org
Change-Id: I0a1dbc915683d76248c8392cb641978e8a7c5441
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1921637Reviewed-by: Tina Wang <tinazwang@chromium.org>
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716314}

chrome/test/chromedriver/test/run_py_tests.py

@@ -109,6 +109,8 @@ _OS_SPECIFIC_FILTER['mac'] = [
     'MobileEmulationCapabilityTest.testTapElement',
     # https://bugs.chromium.org/p/chromium/issues/detail?id=946023
     'ChromeDriverTest.testWindowFullScreen',
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1025967
+    'ChromeDriverTestWithCustomCapability.testEagerMode',
 ]
 
 _DESKTOP_NEGATIVE_FILTER = [