[ChromeDriver] Disable Python touch tests on Android platform

The following Python tests are failing on Android platform
with latest ChromeDriver.

ChromeDriverTest.testActionsTouchTap,
ChromeDriverTest.testTouchDownMoveUpElement,
ChromeDriverTest.testTouchFlickElement,

Disabling those tests.

Bug: chromedriver:2786
Change-Id: I163a7630b3364ecea0c149551e86548ebab7758c
Reviewed-on: https://chromium-review.googlesource.com/c/1480971
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Artur Khachatryan <khachatryan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634077}
1 file changed