[ModalDialog] Touch filtering for obscured button

Add support for touch filtering for buttons obscured by another visible
window. This change is needed for migrating permission dialogs to
ModalDialogManager.

In this change:
- Add boolean property FILTER_TOUCH_FOR_SECURITY to ModalDialogProperties
- Add logic in ModalDialogView to filter touch events
- Propagate the property to ModalDialogView through ModalDialogViewBinder

BUG=940046

Change-Id: I6f363f3922c3ba2883f24b376347f305590478a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1524909
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Becky Zhou <huayinz@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642726}
5 files changed