Move RTCVideoSource to webrtc/api/objc.

webrtc/api/objc/RTCVideoSource.mm

+/*
+ *  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.
+ */
+
+#import "RTCVideoSource.h"
+
+#import "webrtc/api/objc/RTCMediaSource+Private.h"
+#import "webrtc/api/objc/RTCVideoSource+Private.h"
+
+@implementation RTCVideoSource {
+  rtc::scoped_refptr<webrtc::VideoSourceInterface> _nativeVideoSource;
+}
+
+- (NSString *)description {
+  return [NSString stringWithFormat:@"RTCVideoSource:\n%@",
+                                    [[self class] stringForState:self.state]];
+}
+
+#pragma mark - Private
+
+- (rtc::scoped_refptr<webrtc::MediaSourceInterface>)nativeMediaSource {
+  return _nativeVideoSource;
+}
+
+- (rtc::scoped_refptr<webrtc::VideoSourceInterface>)nativeVideoSource {
+  return _nativeVideoSource;
+}
+
+- (instancetype)initWithNativeVideoSource:
+    (rtc::scoped_refptr<webrtc::VideoSourceInterface>)nativeVideoSource {
+  if (self = [super init]) {
+    _nativeVideoSource = nativeVideoSource;
+  }
+  return self;
+}
+
+@end