The extension icon on the far right is invisible when about to dragging.

The extension icon on the far right is invisible when about to dragging.

The browser action button on the far right is invisible when user will
be dragging the browser actions container.

Because the browser action buttons, which don't locate at the extension
bar, will be set to be hidden when the dragging finished. So the hidden
buttons must be set to be visible before the dragging starts in the next
time in order to let user know which extension is coming.

BUG=424080
TEST=manually tested.

Committed: https://crrev.com/5455db156d000d30e1b3ae26e5d6aaabf47dee93
Cr-Commit-Position: refs/heads/master@{#300049}

[Malcolm, 2014-10-16 09:35:25]

malcolm.2.wang@gmail.com changed reviewers:
+ rsesek@chromium.org

[Malcolm, 2014-10-16 09:35:25]

Hi rsesek,

I don't find the proper reviewer for extensions, would you help me to have a
look
at it? It's a very small UI related issue. 

Thanks!

Malcolm

[Robert Sesek, 2014-10-16 13:36:43]

LGTM

[Malcolm, 2014-10-17 02:05:52]

The CQ bit was checked by malcolm.2.wang@gmail.com

[commit-bot: I haz the power, 2014-10-17 02:07:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/662593002/1

[commit-bot: I haz the power, 2014-10-17 02:50:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-17 02:51:23]

Patchset 1 (id:??) landed as
https://crrev.com/5455db156d000d30e1b3ae26e5d6aaabf47dee93
Cr-Commit-Position: refs/heads/master@{#300049}