Reland of Add unit tests for RTCMTLVideoView.

Reland of Add unit tests for RTCMTLVideoView. (patchset #1 id:1 of https://codereview.webrtc.org/2733953006/ )

Reason for revert:
Dependant CL has been relanded

Original issue's description:
> Revert of Add unit tests for RTCMTLVideoView. (patchset #6 id:100001 of https://codereview.webrtc.org/2723903003/ )
> 
> Reason for revert:
> This CL depends on a reverted CL.
> 
> Original issue's description:
> > Add unit tests for RTCMTLVideoView.
> > 
> > To properly test the functionality,  following changes  were needed
> > - Make RTCMTLVideoView compiliable for all cpu architectures not just arm64.
> > This is needed so that the test can run on any device and on simulator as well.
> > - Refactor RTCMTLVideoView to have  mockable class methods.
> > The unittest class, RTCMTLVideoViewTests was designed to provide easy transition
> > to XCTest when the time comes for that.
> > To transition to XCTest it would suffice to inherit from XCTestCase and remove
> > the gtest methods.
> > 
> > BUG=webrtc:7079
> > 
> > Review-Url: https://codereview.webrtc.org/2723903003
> > Cr-Commit-Position: refs/heads/master@{#17014}
> > Committed: https://chromium.googlesource.com/external/webrtc/+/0ebe0199acd1070f17ca2abc5bc22fdd8b0861ca
> 
> TBR=magjed@webrtc.org,denicija@webrtc.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=webrtc:7079
> 
> Review-Url: https://codereview.webrtc.org/2733953006
> Cr-Commit-Position: refs/heads/master@{#17118}
> Committed: https://chromium.googlesource.com/external/webrtc/+/96d91524fa66b9a2e4f9fbbbc9c5e5149021a3f0

TBR=magjed@webrtc.org,denicija@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7079
Review-Url: https://codereview.webrtc.org/2743663002
Cr-Commit-Position: refs/heads/master@{#17140}
Committed: https://chromium.googlesource.com/external/webrtc/+/954d9b943bff1c0ed834903a973f67ee1842b04a

[kthelgason, 2017-03-09 11:36:48]

The CQ bit was checked by kthelgason@webrtc.org

[kthelgason, 2017-03-09 11:36:48]

Created Reland of Add unit tests for RTCMTLVideoView.

[commit-bot: I haz the power, 2017-03-09 11:36:52]

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, 2017-03-09 11:36:58]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489059408410560, "parent_rev":
"a2fb30c8cb29eec755fe931db7bf5aecf0d8dbbf", "commit_rev":
"954d9b943bff1c0ed834903a973f67ee1842b04a"}

[commit-bot: I haz the power, 2017-03-09 11:37:00]

Description was changed from

==========
Reland of Add unit tests for RTCMTLVideoView. (patchset #1 id:1 of
https://codereview.webrtc.org/2733953006/ )

Reason for revert:
Dependant CL has been relanded

Original issue's description:
> Revert of Add unit tests for RTCMTLVideoView. (patchset #6 id:100001 of
https://codereview.webrtc.org/2723903003/ )
> 
> Reason for revert:
> This CL depends on a reverted CL.
> 
> Original issue's description:
> > Add unit tests for RTCMTLVideoView.
> > 
> > To properly test the functionality,  following changes  were needed
> > - Make RTCMTLVideoView compiliable for all cpu architectures not just arm64.
> > This is needed so that the test can run on any device and on simulator as
well.
> > - Refactor RTCMTLVideoView to have  mockable class methods.
> > The unittest class, RTCMTLVideoViewTests was designed to provide easy
transition
> > to XCTest when the time comes for that.
> > To transition to XCTest it would suffice to inherit from XCTestCase and
remove
> > the gtest methods.
> > 
> > BUG=webrtc:7079
> > 
> > Review-Url: https://codereview.webrtc.org/2723903003
> > Cr-Commit-Position: refs/heads/master@{#17014}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/0ebe0199acd1070f17ca2abc5...
> 
> TBR=magjed@webrtc.org,denicija@webrtc.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=webrtc:7079
> 
> Review-Url: https://codereview.webrtc.org/2733953006
> Cr-Commit-Position: refs/heads/master@{#17118}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/96d91524fa66b9a2e4f9fbbbc...

TBR=magjed@webrtc.org,denicija@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7079
==========

to

==========
Reland of Add unit tests for RTCMTLVideoView. (patchset #1 id:1 of
https://codereview.webrtc.org/2733953006/ )

Reason for revert:
Dependant CL has been relanded

Original issue's description:
> Revert of Add unit tests for RTCMTLVideoView. (patchset #6 id:100001 of
https://codereview.webrtc.org/2723903003/ )
> 
> Reason for revert:
> This CL depends on a reverted CL.
> 
> Original issue's description:
> > Add unit tests for RTCMTLVideoView.
> > 
> > To properly test the functionality,  following changes  were needed
> > - Make RTCMTLVideoView compiliable for all cpu architectures not just arm64.
> > This is needed so that the test can run on any device and on simulator as
well.
> > - Refactor RTCMTLVideoView to have  mockable class methods.
> > The unittest class, RTCMTLVideoViewTests was designed to provide easy
transition
> > to XCTest when the time comes for that.
> > To transition to XCTest it would suffice to inherit from XCTestCase and
remove
> > the gtest methods.
> > 
> > BUG=webrtc:7079
> > 
> > Review-Url: https://codereview.webrtc.org/2723903003
> > Cr-Commit-Position: refs/heads/master@{#17014}
> > Committed:
https://chromium.googlesource.com/external/webrtc/+/0ebe0199acd1070f17ca2abc5...
> 
> TBR=magjed@webrtc.org,denicija@webrtc.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=webrtc:7079
> 
> Review-Url: https://codereview.webrtc.org/2733953006
> Cr-Commit-Position: refs/heads/master@{#17118}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/96d91524fa66b9a2e4f9fbbbc...

TBR=magjed@webrtc.org,denicija@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7079

Review-Url: https://codereview.webrtc.org/2743663002
Cr-Commit-Position: refs/heads/master@{#17140}
Committed:
https://chromium.googlesource.com/external/webrtc/+/954d9b943bff1c0ed834903a9...
==========

[commit-bot: I haz the power, 2017-03-09 11:37:01]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/954d9b943bff1c0ed834903a9...

[magjed_webrtc, 2017-03-09 12:37:53]

lgtm