Add option to reset Android video renderer first frame flag.

Add option to reset Android video renderer first frame flag.

This allows to correctly report first frame event in applications which
use same remote video renderer for multiple calls.

R=wzh@webrtc.org

Committed: https://crrev.com/09f1350efaa486d84e3b6fede94ced6aa404a85f
Cr-Commit-Position: refs/heads/master@{#10176}

[AlexG, 2015-10-05 19:49:35]

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

[AlexG, 2015-10-05 19:49:36]

PTAL

[AlexG, 2015-10-05 19:49:57]

The CQ bit was checked by glaznev@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2015-10-05 19:50:17]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1384353002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1384353002/1

[wzh, 2015-10-05 19:51:12]

lgtm

[AlexG, 2015-10-05 20:01:45]

Committed patchset #1 (id:1) manually as
09f1350efaa486d84e3b6fede94ced6aa404a85f (presubmit successful).

[commit-bot: I haz the power, 2015-10-05 20:01:50]

Patchset 1 (id:??) landed as
https://crrev.com/09f1350efaa486d84e3b6fede94ced6aa404a85f
Cr-Commit-Position: refs/heads/master@{#10176}