Call directly to c callbacks in Invoke instead of transitioning to js and back out.

Call directly to c callbacks in Invoke instead of transitioning to js and back out.

BUG=

Committed: https://crrev.com/ce457e2b596c3ccf5bf454eeed0969f3f3efd174
Cr-Commit-Position: refs/heads/master@{#26231}

[Toon Verwaest, 2015-01-22 12:32:26]

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

[Toon Verwaest, 2015-01-22 12:32:26]

lgtm

[dcarney, 2015-01-22 21:09:08]

The CQ bit was checked by dcarney@chromium.org

[commit-bot: I haz the power, 2015-01-22 21:09:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/864273002/150001

[commit-bot: I haz the power, 2015-01-22 21:37:12]

Committed patchset #9 (id:150001)

[commit-bot: I haz the power, 2015-01-22 21:37:27]

Patchset 9 (id:??) landed as
https://crrev.com/ce457e2b596c3ccf5bf454eeed0969f3f3efd174
Cr-Commit-Position: refs/heads/master@{#26231}

[Michael Achenbach, 2015-01-23 07:14:36]

Looks like this causes lots of flakes in cctest/test-api/Threading4

[dcarney, 2015-01-23 08:53:12]

A revert of this CL (patchset #9 id:150001) has been created in
https://codereview.chromium.org/873583003/ by dcarney@chromium.org.

The reason for reverting is: threading4 flakiness.

[dcarney, 2015-01-23 10:18:47]

Patchset #10 (id:170001) has been deleted