Add method on AVFoundation capturer to adapt output format.

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

Index: webrtc/sdk/objc/Framework/Classes/RTCAVFoundationVideoSource.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCAVFoundationVideoSource.mm b/webrtc/sdk/objc/Framework/Classes/RTCAVFoundationVideoSource.mm
index 528e8cb62440d3a02e490ffe20b95f49b1f4ab0a..ba5af842d33ee1588e71716cc5531ccaa49cd5c0 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCAVFoundationVideoSource.mm
+++ b/webrtc/sdk/objc/Framework/Classes/RTCAVFoundationVideoSource.mm
@@ -32,6 +32,10 @@
   return [super initWithNativeVideoSource:source];
 }
 
+- (void)adaptOutputFormatToWidth:(int)width height:(int)height fps:(int)fps {

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

nit: I'm not sure if you need to line up the colons or not.

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

The styleguide reads to me like you only need to do that if it's too long to fit
on one line.

From google obj-c guide:
"If you have too many parameters to fit on one line, giving each its own line is
preferred. If multiple lines are used, align each using the colon before the
parameter."

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

Acknowledged.

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

there is some leeway here. I would prefer them on separate lines because it's
easier to read that way.

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

Acknowledged.

+  self.capturer->AdaptOutputFormat(width, height, fps);
+}
+
 - (BOOL)canUseBackCamera {
   return self.capturer->CanUseBackCamera();
 }