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  * Some applications (such as maps) seem to disable gesture
    recognition, leading to a situation where onGestureEvent is never
    being called with ET_GESTURE_TAP_DOWN.
  * This led to applications timing out and returning to the home
    screen despite the user performing activity on the screen.
  * This CL treats a touch press event as a 'tap down', without
    requiring a GestureEvent.

Bug: internal b/113205924
Test: manual on device
Change-Id: I0bfa1bc8c2bd8685ae41de527f2b79477b176a3e
Reviewed-on: https://chromium-review.googlesource.com/1214329Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589787}