[Extensions UI] Handle multiple warning bubbles racing to show
If multiple windows all tried to create a warning bubble at the same
time, it would be handled incorrectly. Though only one bubble would
show, the others would be destructed and potentially undo the work the
first did (like highlighting extensions on the toolbar).
Instead, link the warning bubbles with the toolbar model, which is per-
profile and handles the highlighting logic. Also add a regression test,
and beef up some existing tests.
BUG=620434
Review-Url: https://codereview.chromium.org/2076093004
Cr-Commit-Position: refs/heads/master@{#400849}
13 files changed
