Revert "Revert "Revert "Revert "Support more formats in RTCVideoFrame""""

This reverts commit 1cfeb435427a2fa677a495e34c882096efc193d0.

Reason for revert: Fix unit test

Original change's description:
> Revert "Revert "Revert "Support more formats in RTCVideoFrame"""
> 
> This reverts commit 7583390d1a3a7c4e9a77da0d77250abac0c34d1d.
> 
> Reason for revert: Breaks unit tests
> 
> Original change's description:
> > Revert "Revert "Support more formats in RTCVideoFrame""
> > 
> > This reverts commit 0789dab2cbd1617e94d7300e375163d42345f3d4.
> > 
> > Reason for revert: Include obc_corevideoframebuffer target
> > 
> > Original change's description:
> > > Revert "Support more formats in RTCVideoFrame"
> > > 
> > > This reverts commit bd2220a9c496ef2e8567b68d4be9435a110bdc34.
> > > 
> > > Reason for revert: Broke external clients
> > > 
> > > Original change's description:
> > > > Support more formats in RTCVideoFrame
> > > > 
> > > > Implement Obj-C version of webrtc::VideoFrameBuffer and use that in
> > > > RTCVideoFrame.
> > > > 
> > > > Bug: webrtc:7785
> > > > Change-Id: I49f42bcf451dd6769b3a79a65fe7b400dce22677
> > > > Reviewed-on: https://chromium-review.googlesource.com/536773
> > > > Commit-Queue: Anders Carlsson <andersc@webrtc.org>
> > > > Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
> > > > Cr-Commit-Position: refs/heads/master@{#18691}
> > > 
> > > TBR=magjed@webrtc.org,andersc@webrtc.org
> > > 
> > > Change-Id: Id765dd9543ed0613a6b2de108b268c3501025fcd
> > > No-Presubmit: true
> > > No-Tree-Checks: true
> > > No-Try: true
> > > Bug: webrtc:7785
> > > Reviewed-on: https://chromium-review.googlesource.com/542837
> > > Reviewed-by: Anders Carlsson <andersc@webrtc.org>
> > > Commit-Queue: Anders Carlsson <andersc@webrtc.org>
> > > Cr-Commit-Position: refs/heads/master@{#18697}
> > 
> > TBR=magjed@webrtc.org,andersc@webrtc.org
> > 
> > Change-Id: I1ef5313b4a6c56eb8c7fd02d95db62c4e3c00255
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: webrtc:7785
> > Reviewed-on: https://chromium-review.googlesource.com/542838
> > Commit-Queue: Anders Carlsson <andersc@webrtc.org>
> > Reviewed-by: Anders Carlsson <andersc@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#18716}
> 
> TBR=magjed@webrtc.org,andersc@webrtc.org
> 
> Change-Id: Id12f33698eb02041607cb9a5c54f37f01bfac5b1
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: webrtc:7785
> Reviewed-on: https://chromium-review.googlesource.com/544840
> Reviewed-by: Anders Carlsson <andersc@webrtc.org>
> Commit-Queue: Anders Carlsson <andersc@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#18718}

TBR=magjed@webrtc.org,andersc@webrtc.org

Change-Id: I184303ecba8db91ef7de709f982a295a2efe92eb
Bug: webrtc:7785
Reviewed-on: https://chromium-review.googlesource.com/544841
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18731}

webrtc/sdk/objc/Framework/Classes/Video/RTCI420Buffer.mm

@@ -0,0 +1,108 @@
+/*
+ *  Copyright 2017 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 "WebRTC/RTCVideoFrameBuffer.h"
+
+#include "webrtc/api/video/i420_buffer.h"
+
+@implementation RTCI420Buffer {
+ @protected
+  rtc::scoped_refptr<webrtc::I420BufferInterface> _i420Buffer;
+}
+
+- (instancetype)initWithWidth:(int)width height:(int)height {
+  if (self = [super init]) {
+    _i420Buffer = webrtc::I420Buffer::Create(width, height);
+  }
+
+  return self;
+}
+
+- (instancetype)initWithWidth:(int)width
+                       height:(int)height
+                      strideY:(int)strideY
+                      strideU:(int)strideU
+                      strideV:(int)strideV {
+  if (self = [super init]) {
+    _i420Buffer = webrtc::I420Buffer::Create(width, height, strideY, strideU, strideV);
+  }
+
+  return self;
+}
+
+- (instancetype)initWithFrameBuffer:(rtc::scoped_refptr<webrtc::I420BufferInterface>)i420Buffer {
+  if (self = [super init]) {
+    _i420Buffer = i420Buffer;
+  }
+
+  return self;
+}
+
+- (int)width {
+  return _i420Buffer->width();
+}
+
+- (int)height {
+  return _i420Buffer->height();
+}
+
+- (int)strideY {
+  return _i420Buffer->StrideY();
+}
+
+- (int)strideU {
+  return _i420Buffer->StrideU();
+}
+
+- (int)strideV {
+  return _i420Buffer->StrideV();
+}
+
+- (int)chromaWidth {
+  return _i420Buffer->ChromaWidth();
+}
+
+- (int)chromaHeight {
+  return _i420Buffer->ChromaHeight();
+}
+
+- (const uint8_t *)dataY {
+  return _i420Buffer->DataY();
+}
+
+- (const uint8_t *)dataU {
+  return _i420Buffer->DataU();
+}
+
+- (const uint8_t *)dataV {
+  return _i420Buffer->DataV();
+}
+
+- (id<RTCI420Buffer>)toI420 {
+  return self;
+}
+
+@end
+
+@implementation RTCMutableI420Buffer
+
+- (uint8_t *)mutableDataY {
+  return static_cast<webrtc::I420Buffer *>(_i420Buffer.get())->MutableDataY();
+}
+
+- (uint8_t *)mutableDataU {
+  return static_cast<webrtc::I420Buffer *>(_i420Buffer.get())->MutableDataU();
+}
+
+- (uint8_t *)mutableDataV {
+  return static_cast<webrtc::I420Buffer *>(_i420Buffer.get())->MutableDataV();
+}
+
+@end