Add method on AVFoundation capturer to adapt output format.

webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm

Index: webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm b/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
index 57425665f98a559ac1dfee62a4f0400d4c6d650c..28ae3f2bd4102ac119778141a1cca2a0ed660052 100644
--- a/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
+++ b/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
@@ -113,6 +113,11 @@ bool AVFoundationVideoCapturer::GetUseBackCamera() const {
   return _capturer.useBackCamera;
 }
 
+void AVFoundationVideoCapturer::AdaptOutputFormat(int width, int height, int fps) {

[magjed_webrtc, 2016/11/23 13:53:40]

nit: Too long lines.

[kthelgason, 2016/11/23 14:01:48]

Don't we have 100 char limits in objc files?

[magjed_webrtc, 2016/11/24 13:04:31]

Yeah, maybe, but the rest of this file is indented at 80 char at least. I'll
leave it up to Zeke.

[tkchin_webrtc, 2016/11/30 22:08:52]

100char change came after the file was written. 100 is fine.

[kthelgason, 2016/12/01 09:16:59]

Acknowledged.

+  cricket::VideoFormat format(width, height, cricket::VideoFormat::FpsToInterval(fps), 0);
+  video_adapter()->OnOutputFormatRequest(format);
+}
+
 void AVFoundationVideoCapturer::CaptureSampleBuffer(
     CMSampleBufferRef sample_buffer, VideoRotation rotation) {
   if (CMSampleBufferGetNumSamples(sample_buffer) != 1 ||