Pass keyschange event to blink

Pass keyschange event to blink

Take the set of KeyInformation and pass it on to blink.
Layout tests will be updated to verify this event in a subsequent CL.

BUG=432671
TEST=existing EME tests pass

Committed: https://crrev.com/17363ead10ac73d2a2fee92480a65b58962471b9
Cr-Commit-Position: refs/heads/master@{#312528}

[jrummell, 2015-01-17 00:19:39]

jrummell@chromium.org changed reviewers:
+ ddorwin@chromium.org, sandersd@chromium.org

[jrummell, 2015-01-17 00:19:39]

PTAL. This is the Chromium side for https://codereview.chromium.org/858693002/.

[sandersd (OOO until July 31), 2015-01-17 00:28:57]

lgtm

[jrummell, 2015-01-22 00:15:08]

The CQ bit was checked by jrummell@chromium.org

[commit-bot: I haz the power, 2015-01-22 00:16:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/855773002/20001

[commit-bot: I haz the power, 2015-01-22 02:17:01]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-22 02:17:59]

Patchset 2 (id:??) landed as
https://crrev.com/17363ead10ac73d2a2fee92480a65b58962471b9
Cr-Commit-Position: refs/heads/master@{#312528}