Build dynamic iOS SDK.

- Places most ObjC code into webrtc/sdk/objc instead.
- New gyp targets to build, strip and export symbols for dylib.
- Removes old script used to generate dylib.

BUG=

Review URL: https://codereview.webrtc.org/1903663002

Cr-Commit-Position: refs/heads/master@{#12524}

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCEAGLVideoView.h

@@ -0,0 +1,38 @@
+/*
+ *  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 <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+#import <WebRTC/RTCMacros.h>
+#import <WebRTC/RTCVideoRenderer.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class RTCEAGLVideoView;
+RTC_EXPORT
+@protocol RTCEAGLVideoViewDelegate
+
+- (void)videoView:(RTCEAGLVideoView *)videoView didChangeVideoSize:(CGSize)size;
+
+@end
+
+/**
+ * RTCEAGLVideoView is an RTCVideoRenderer which renders video frames in its
+ * bounds using OpenGLES 2.0.
+ */
+RTC_EXPORT
+@interface RTCEAGLVideoView : UIView <RTCVideoRenderer>
+
+@property(nonatomic, weak) id<RTCEAGLVideoViewDelegate> delegate;
+
+@end
+
+NS_ASSUME_NONNULL_END