GitLab

Ctrl+Shift+R locks bubbles from closing and allows bubbles and their
elements to be inspected.

Change-Id: Iba876a5dcc78324be4750823f6f53a307559bdfe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1703459
Commit-Queue: Kristyn Hamasaki <khamasaki@google.com>
Reviewed-by: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680118}