Update/move RTCVideoRendererAdapter to webrtc/api/objc.

webrtc/api/objc/RTCVideoRendererAdapter.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 "RTCVideoRendererAdapter.h"
+
+#import "webrtc/api/objc/RTCVideoFrame+Private.h"
+#import "webrtc/api/objc/RTCVideoRendererAdapter+Private.h"
+
+namespace webrtc {
+
+class VideoRendererAdapter : public VideoRendererInterface {
+ public:
+  VideoRendererAdapter(RTCVideoRendererAdapter* adapter) {
+    adapter_ = adapter;
+    size_ = CGSizeZero;
+  }
+
+  void RenderFrame(const cricket::VideoFrame *nativeVideoFrame) override {
+    const cricket::VideoFrame *frame =
+        nativeVideoFrame->GetCopyWithRotationApplied();
+    CGSize current_size = CGSizeMake(frame->GetWidth(), frame->GetHeight());
+    if (!CGSizeEqualToSize(size_, current_size)) {
+      size_ = current_size;
+      [adapter_.videoRenderer setSize:size_];
+    }
+    RTCVideoFrame *videoFrame =
+        [[RTCVideoFrame alloc] initWithNativeFrame:frame];
+    [adapter_.videoRenderer renderFrame:videoFrame];
+  }
+
+ private:
+  __weak RTCVideoRendererAdapter *adapter_;
+  CGSize size_;
+};
+}
+
+@implementation RTCVideoRendererAdapter {
+  rtc::scoped_ptr<webrtc::VideoRendererAdapter> _adapter;
+}
+
+@synthesize videoRenderer = _videoRenderer;
+
+- (instancetype)initWithNativeRenderer:(id<RTCVideoRenderer>)videoRenderer {
+  NSParameterAssert(videoRenderer);
+  if (self = [super init]) {
+    _videoRenderer = videoRenderer;
+    _adapter.reset(new webrtc::VideoRendererAdapter(self));
+  }
+  return self;
+}
+
+- (webrtc::VideoRendererInterface *)nativeVideoRenderer {
+  return _adapter.get();
+}
+
+@end