Properly export the symbols of video frame-buffer classes for link-time

Properly export the symbols of video frame-buffer classes for link-time

Linking external ObjC / Swift apps fails when the app code is using any
of the new frame-buffer classes RTCI420Buffer, RTCMutableI420Buffer, or
RTCCVPixelBuffer. To fix, we need to add the appropriate attribute to
the classes (e.g. using the RTC_EXPORT macro).

BUG=None

Review-Url: https://codereview.webrtc.org/2961293002
Cr-Commit-Position: refs/heads/master@{#18840}
Committed: https://chromium.googlesource.com/external/webrtc/+/26afe214add12dbc3aa6e7c0265539eff8dc5d20

[VladimirTechMan, 2017-06-29 15:10:41]

vladimirtechman@gmail.com changed reviewers:
+ kjellander@webrtc.org, magjed@webrtc.org

[magjed_webrtc, 2017-06-29 15:22:30]

lgtm

[VladimirTechMan, 2017-06-29 15:52:47]

The CQ bit was checked by vladimirtechman@gmail.com

[commit-bot: I haz the power, 2017-06-29 15:53:00]

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, 2017-06-29 16:11:10]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1498751567822330, "parent_rev":
"06b47c520dc9814da6a0fcaaf548b65ffea7cab8", "commit_rev":
"26afe214add12dbc3aa6e7c0265539eff8dc5d20"}

[commit-bot: I haz the power, 2017-06-29 16:11:14]

Description was changed from

==========
Properly export the symbols of video frame-buffer classes for link-time

Linking external ObjC / Swift apps fails when the app code is using any
of the new frame-buffer classes RTCI420Buffer, RTCMutableI420Buffer, or
RTCCVPixelBuffer. To fix, we need to add the appropriate attribute to
the classes (e.g. using the RTC_EXPORT macro).

BUG=None
==========

to

==========
Properly export the symbols of video frame-buffer classes for link-time

Linking external ObjC / Swift apps fails when the app code is using any
of the new frame-buffer classes RTCI420Buffer, RTCMutableI420Buffer, or
RTCCVPixelBuffer. To fix, we need to add the appropriate attribute to
the classes (e.g. using the RTC_EXPORT macro).

BUG=None

Review-Url: https://codereview.webrtc.org/2961293002
Cr-Commit-Position: refs/heads/master@{#18840}
Committed:
https://chromium.googlesource.com/external/webrtc/+/26afe214add12dbc3aa6e7c02...
==========

[commit-bot: I haz the power, 2017-06-29 16:11:15]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/26afe214add12dbc3aa6e7c02...