[Android] Thoroughly reset gesture detection upon page navigation
The current gesture reset logic on Android uses a cancellation event
synthesized from the active touch sequence. However, this fails to reset
detection for timeout-based events, e.g. delayed tap and double-tap,
just after the pointer has just been released. Expose an explicit gesture
detection reset hook on the GestureProvider, called when the main
frame navigates or the window loses focus.
BUG=418402
Review URL: https://codereview.chromium.org/717573004
Cr-Commit-Position: refs/heads/master@{#303749}
6 files changed
