Add a test for a simulated click on a link on tapping of gesture.

Add a test for a simulated click on a link on tapping of gesture.

When tapping of gesture with the Ctrl key, the click is simulated.
The test checks if the new tab is opened on the background.

BUG=464718
R=jochen@chromium.org
TEST=PopupBlockerBrowserTest.TapGestureWithCtrlKey

Committed: https://crrev.com/8143cbe34dd460c28f4b1996f563c9bad0a0e6ec
Cr-Commit-Position: refs/heads/master@{#321157}

[Miyoung Shin, 2015-03-15 16:12:14]

PTAL.

We can land this after landing the patch at http://crrev.com/1010613002.

[Miyoung Shin, 2015-03-17 06:05:04]

myid.shin@samsung.com changed reviewers:
+ jochen@chromium.org
- jochen@chromum.org

[jochen (gone - plz use gerrit), 2015-03-18 15:23:33]

lgtm

[Miyoung Shin, 2015-03-18 16:17:26]

The CQ bit was checked by myid.shin@samsung.com

[commit-bot: I haz the power, 2015-03-18 16:17:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1008233002/1

[commit-bot: I haz the power, 2015-03-18 17:26:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-18 17:27:10]

Patchset 1 (id:??) landed as
https://crrev.com/8143cbe34dd460c28f4b1996f563c9bad0a0e6ec
Cr-Commit-Position: refs/heads/master@{#321157}