PeerConnectionClientTest - Test decode to texture.

Add unit test to decode to a surface texture.
Also parameterise on PeerConnectionParameters to prepare for more test variations. (capture and encode to textures)

Committed: https://crrev.com/a9046d0969ecd0509e358ed201dad7661c88c72f
Cr-Commit-Position: refs/heads/master@{#10279}

[perkj_webrtc, 2015-10-14 14:08:14]

Patchset #2 (id:20001) has been deleted

[perkj_webrtc, 2015-10-14 14:11:20]

perkj@webrtc.org changed reviewers:
+ glaznev@webrtc.org

[perkj_webrtc, 2015-10-14 14:11:45]

Please?

[AlexG, 2015-10-14 16:54:40]

lgtm. 
Thanks!

[perkj_webrtc, 2015-10-14 19:08:35]

The CQ bit was checked by perkj@webrtc.org

[commit-bot: I haz the power, 2015-10-14 19:08:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1404093002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1404093002/40001

[commit-bot: I haz the power, 2015-10-14 19:55:20]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-10-14 19:55:45]

Patchset 2 (id:??) landed as
https://crrev.com/a9046d0969ecd0509e358ed201dad7661c88c72f
Cr-Commit-Position: refs/heads/master@{#10279}