GitLab

Before this CL, we would hide the keyboard before releasing the button, which is
incorrect behavior. This CL also makes the background unfocusable so clicking on
it doesn't steal focus from text fields and hide the keyboard.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I0a74c7f3d036e8bff6fc4daa2ce6b47f33f2a2e3
Reviewed-on: https://chromium-review.googlesource.com/828120Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Yash Malik <ymalik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524380}