Move AndroidVideoTrackSourceObserver from API to src

Move AndroidVideoTrackSourceObserver from API to src

BUG=webrtc:7172
Review-Url: https://codereview.webrtc.org/2803593004
Cr-Commit-Position: refs/heads/master@{#17562}
Committed: https://chromium.googlesource.com/external/webrtc/+/177b17e050965c4150d1bd0d9602561b704eca1b

[magjed_webrtc, 2017-04-05 19:39:13]

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

[commit-bot: I haz the power, 2017-04-05 19:39:14]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[magjed_webrtc, 2017-04-05 19:39:17]

Description was changed from

==========
Move AndroidVideoTrackSourceObserver from API to src

BUG=webrtc:7172
==========

to

==========
Move AndroidVideoTrackSourceObserver from API to src

BUG=webrtc:7172
==========

[magjed_webrtc, 2017-04-05 19:39:17]

magjed@webrtc.org changed reviewers:
+ sakal@webrtc.org

[commit-bot: I haz the power, 2017-04-05 20:00:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-05 20:00:04]

Dry run: This issue passed the CQ dry run.

[magjed_webrtc, 2017-04-06 07:44:40]

Sami - please take a look.

[sakal, 2017-04-06 07:55:43]

lgtm

[magjed_webrtc, 2017-04-06 11:27:29]

The CQ bit was checked by magjed@webrtc.org

[commit-bot: I haz the power, 2017-04-06 11:27:35]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-04-06 11:31:26]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491478049777510, "parent_rev":
"639d46a7ab2e6fbecd3fc835d0f161c6e854d2b4", "commit_rev":
"177b17e050965c4150d1bd0d9602561b704eca1b"}

[commit-bot: I haz the power, 2017-04-06 11:31:30]

Description was changed from

==========
Move AndroidVideoTrackSourceObserver from API to src

BUG=webrtc:7172
==========

to

==========
Move AndroidVideoTrackSourceObserver from API to src

BUG=webrtc:7172

Review-Url: https://codereview.webrtc.org/2803593004
Cr-Commit-Position: refs/heads/master@{#17562}
Committed:
https://chromium.googlesource.com/external/webrtc/+/177b17e050965c4150d1bd0d9...
==========

[commit-bot: I haz the power, 2017-04-06 11:31:34]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/177b17e050965c4150d1bd0d9...