[Media Router WebUI] Add test for search focus when switching windows

[Media Router WebUI] Add test for search focus when switching windows

This change adds a browser test for the following case:

The user selects the search input and then presses the Escape key. The
dialog is now in the sink list view but keyboard focus is still on the
search input. The user switches to another window and then back to the
dialog. The container should remain in the sink list view and should not
transition to the filter view, even though a focus event is fired on the
search input.

BUG=592723
R=apacible@chromium.org

Committed: https://crrev.com/89251be1f810dbf03e2a4a2865e20d982c0e6d05
Cr-Commit-Position: refs/heads/master@{#396415}

[btolsch, 2016-05-27 02:39:10]

I think I figured out a reasonable way to test the focus behavior.  Although
focusin looks like it might be a better event to use for making this focus
problem easier, it seems to have some inconsistent behavior in the dialog right
now. PTAL, thanks!

[apacible, 2016-05-27 05:03:32]

lgtm + nit

https://codereview.chromium.org/2016193002/diff/1/chrome/test/data/webui/medi...
File chrome/test/data/webui/media_router/media_router_container_filter_tests.js
(right):

https://codereview.chromium.org/2016193002/diff/1/chrome/test/data/webui/medi...
chrome/test/data/webui/media_router/media_router_container_filter_tests.js:628:
window.dispatchEvent(blur);
nit: Add a few comments here narrating how this reflects the user switching
windows/tabs.

[btolsch, 2016-05-27 06:07:36]

The CQ bit was checked by btolsch@chromium.org

[btolsch, 2016-05-27 06:07:36]

The patchset sent to the CQ was uploaded after l-g-t-m from
apacible@chromium.org
Link to the patchset: https://codereview.chromium.org/2016193002/#ps20001
(title: "Add test comment explaining focus events")

[commit-bot: I haz the power, 2016-05-27 06:08:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2016193002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2016193002/20001

[commit-bot: I haz the power, 2016-05-27 07:23:26]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-05-27 07:25:01]

Description was changed from

==========
[Media Router WebUI] Add test for search focus when switching windows

This change adds a browser test for the following case:

The user selects the search input and then presses the Escape key. The
dialog is now in the sink list view but keyboard focus is still on the
search input. The user switches to another window and then back to the
dialog. The container should remain in the sink list view and should not
transition to the filter view, even though a focus event is fired on the
search input.

BUG=592723
R=apacible@chromium.org
==========

to

==========
[Media Router WebUI] Add test for search focus when switching windows

This change adds a browser test for the following case:

The user selects the search input and then presses the Escape key. The
dialog is now in the sink list view but keyboard focus is still on the
search input. The user switches to another window and then back to the
dialog. The container should remain in the sink list view and should not
transition to the filter view, even though a focus event is fired on the
search input.

BUG=592723
R=apacible@chromium.org

Committed: https://crrev.com/89251be1f810dbf03e2a4a2865e20d982c0e6d05
Cr-Commit-Position: refs/heads/master@{#396415}
==========

[commit-bot: I haz the power, 2016-05-27 07:25:01]

Patchset 2 (id:??) landed as
https://crrev.com/89251be1f810dbf03e2a4a2865e20d982c0e6d05
Cr-Commit-Position: refs/heads/master@{#396415}