Move Objective-C video renderers to webrtc/api/objc.

BUG=
R=tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1542473003 .

Patch from Jon Hjelle <hjon@andyet.net>.

Cr-Commit-Position: refs/heads/master@{#11209}
diff --git a/webrtc/api/objc/RTCNSGLVideoView.h b/webrtc/api/objc/RTCNSGLVideoView.h
new file mode 100644
index 0000000..27eb31e
--- /dev/null
+++ b/webrtc/api/objc/RTCNSGLVideoView.h
@@ -0,0 +1,34 @@
+/*
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#if TARGET_OS_IPHONE
+#error "This file targets OSX."
+#endif
+
+#import <AppKit/NSOpenGLView.h>
+
+#import "RTCVideoRenderer.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class RTCNSGLVideoView;
+@protocol RTCNSGLVideoViewDelegate
+
+- (void)videoView:(RTCNSGLVideoView *)videoView didChangeVideoSize:(CGSize)size;
+
+@end
+
+@interface RTCNSGLVideoView : NSOpenGLView <RTCVideoRenderer>
+
+@property(nonatomic, weak) id<RTCNSGLVideoViewDelegate> delegate;
+
+@end
+
+NS_ASSUME_NONNULL_END