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This CL adds a dialog that is displayed when interaction with permission
dialog is blocked because of overlay window covering permission dialog
buttons.

BUG=1014477

Change-Id: I1ab7a6342f77f28e3179a4f5129d8fcf292f3019
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2198365
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771356}