Devtools: Fix tooltip z-index and add tooltip for dock side

Devtools: Fix tooltip z-index and add tooltip for dock side

Fix z-index of tooltips to appear on top of glass panes such as the new main menu. This also adds a tooltip for toggle dock side tooltip.

BUG=520272, 521206
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200698

[samli, 2015-08-17 01:01:31]

samli@chromium.org changed reviewers:
+ pfeldman@chromium.org

[samli, 2015-08-17 01:29:49]

Added tooltip for dockside shortcut: http://i.imgur.com/orgP7N6.png

[pfeldman, 2015-08-17 18:56:15]

lgtm

[pfeldman, 2015-08-17 23:23:47]

The CQ bit was checked by pfeldman@chromium.org

[commit-bot: I haz the power, 2015-08-17 23:24:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1294033002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1294033002/20001

[commit-bot: I haz the power, 2015-08-18 02:08:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-18 02:08:50]

Try jobs failed on following builders:
  linux_chromium_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[samli, 2015-08-18 04:04:12]

The CQ bit was checked by samli@chromium.org

[commit-bot: I haz the power, 2015-08-18 04:04:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1294033002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1294033002/20001

[commit-bot: I haz the power, 2015-08-18 04:59:04]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=200698