[Effen] Tapping on a menu while it's closing should not make it instantly disappear.

[Effen] Tapping on a menu while it's closing should not make it instantly disappear.

This tries to make the menu controller more careful about the state
transitions it goes through, in particular, not firing off animations
while we're already closing (since that used to trigger the "we're
done animating" callback which then closes the menu forcibly).

R=eseidel@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/886bdc087355f07eab3f1296f0656b5fff61df84

[eseidel, 2015-04-23 19:58:03]

eseidel@chromium.org changed reviewers:
+ eseidel@chromium.org

[eseidel, 2015-04-23 19:58:03]

lgtm

[Hixie, 2015-04-23 20:20:43]

Committed patchset #2 (id:20001) manually as
886bdc087355f07eab3f1296f0656b5fff61df84 (presubmit successful).