Adding Paste Popup behavior Unit Test cases.

Adding Paste Popup behavior Unit Test cases.

Currently there is not enough unit test cases available to cover
the functionality of Paste Popup menu behavior. This patch covers
essential unit test cases for the same.

These tests originally landed in r293222, but were incidentally reverted
due to some pre-existing test failures in the same file.

BUG=

Committed: https://crrev.com/2828132575ca35b26647eeda75979999df5c7871
Cr-Commit-Position: refs/heads/master@{#294353}

[AKVT, 2014-09-10 15:50:28]

ajith.v@samsung.com changed reviewers:
+ aurimas@chromium.org, jdduke@chromium.org

[AKVT, 2014-09-10 15:50:28]

@jdduke PTAL. Earlier UT was indirectly reverted due to reversal of new file
ContentViewCoreSelectionTest.java. Paste Popup UT was passing always, so we can
keep this as it is.

[jdduke (slow), 2014-09-10 20:08:43]

On 2014/09/10 15:50:28, AKV wrote:
> @jdduke PTAL. Earlier UT was indirectly reverted due to reversal of new file
> ContentViewCoreSelectionTest.java. Paste Popup UT was passing always, so we
can
> keep this as it is.

Ah, right, lgtm.

[AKVT, 2014-09-11 06:52:31]

The CQ bit was checked by ajith.v@samsung.com

[commit-bot: I haz the power, 2014-09-11 06:52:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/560883002/1

[commit-bot: I haz the power, 2014-09-11 08:01:23]

Committed patchset #1 (id:1) as 685db76c35bb0ce1f297453f89f6b33157ee2741

[commit-bot: I haz the power, 2014-09-11 08:19:23]

Patchset 1 (id:??) landed as
https://crrev.com/2828132575ca35b26647eeda75979999df5c7871
Cr-Commit-Position: refs/heads/master@{#294353}