Add some modifiers to eventSender for test.

Add some modifiers to eventSender for test.

Some layout test (especially such as mouse event) will use the modifiers.

BUG=none

Committed: https://crrev.com/ffc700e337d3c0d4c1348b1da53ee16aa0c3ed21
Cr-Commit-Position: refs/heads/master@{#304383}

[zino, 2014-11-14 06:47:10]

jinho.bang@samsung.com changed reviewers:
+ tkent@chromium.org

[zino, 2014-11-14 07:38:01]

Please take a look.

Especially, this is needed in
https://codereview.chromium.org/727593003/.

[Rick Byers, 2014-11-14 19:46:29]

rbyers@chromium.org changed reviewers:
+ rbyers@chromium.org

[Rick Byers, 2014-11-14 19:46:30]

This LGTM - just need an OWNER here.

[tkent, 2014-11-17 03:25:36]

The CQ bit was checked by tkent@chromium.org

[tkent, 2014-11-17 03:25:37]

lgtm

[commit-bot: I haz the power, 2014-11-17 03:25:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/732433002/1

[commit-bot: I haz the power, 2014-11-17 04:05:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-17 04:06:22]

Patchset 1 (id:??) landed as
https://crrev.com/ffc700e337d3c0d4c1348b1da53ee16aa0c3ed21
Cr-Commit-Position: refs/heads/master@{#304383}