GitLab

Set the gesture event as handled if it can not be used to drag the window
during window drag. Browser window is special since it has its own logic
to handle the drag.

Bug: 900959, 877976
Change-Id: I6a9416505da7fc92306ad5c364f4be04213dd992
Reviewed-on: https://chromium-review.googlesource.com/c/1332289
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608442}