overview: Add a flag to disable rounded corners.

Test: manual
Bug: 926046
Change-Id: I66534d5f13371eb622ca7c9e5e7fbdcfb8b5c086
Reviewed-on: https://chromium-review.googlesource.com/c/1441961
Reviewed-by: Elly Fong-Jones <[email protected]>
Reviewed-by: Mitsuru Oshima <[email protected]>
Commit-Queue: Sammie Quon <[email protected]>
Cr-Commit-Position: refs/heads/master@{#627484}
8 files changed