[Android] Temporarily suppress shift modifiers for detected tap gestures
Android's UiAutomator unintentionally bundles the shift modifier with
all accessibliity click MotionEvents. The side-effect is that
accessibility clicks (derived from the MotionEvents) are interpreted
as shift+click, which is not meaningfully implemented on Android.
As a temporary workaround, suppress the standalone shift modifier for
touch-derived tap gestures.
BUG=443247
Review URL: https://codereview.chromium.org/
865463002
Cr-Commit-Position: refs/heads/master@{#312385}