OutputSurfaceMojo should bind its SurfacePtr on the impl thread

OutputSurfaceMojo should bind its SurfacePtr on the impl thread

We can't call set_client on the main thread because that determines the thread
affinity of the SurfacePtr. Instead, we need to wait for the BindToClient
callback so we can bind the SurfacePtr on the impl thread.

R=jamesr@chromium.org

Committed: https://crrev.com/faa1c522af8be7a3993bca1399a8d99c492d3185
Cr-Commit-Position: refs/heads/master@{#296474}

[jamesr, 2014-09-24 17:28:44]

lgtm

[abarth-chromium, 2014-09-24 17:33:10]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-09-24 17:33:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/603663002/1

[commit-bot: I haz the power, 2014-09-24 18:32:10]

Committed patchset #1 (id:1) as 02612a6dd65c10693c9f6b725ac92323b89a3f99

[commit-bot: I haz the power, 2014-09-24 18:33:03]

Patchset 1 (id:??) landed as
https://crrev.com/faa1c522af8be7a3993bca1399a8d99c492d3185
Cr-Commit-Position: refs/heads/master@{#296474}