Split iOS sdk in to separate targets

This CL splits the iOS sdk into separate static libraries for video,
audio, ui, common, and peerconnection-related code. This will in the
future make it easier to compile WebRTC without unneeded components.

BUG=webrtc:4867

Review-Url: https://codereview.webrtc.org/2862543002
Cr-Commit-Position: refs/heads/master@{#18166}

webrtc/sdk/objc/Framework/Classes/RTCCameraPreviewView.m

@@ -1,75 +0,0 @@
-/*
- *  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 "WebRTC/RTCCameraPreviewView.h"
-
-#import <AVFoundation/AVFoundation.h>
-#import <UIKit/UIKit.h>
-
-#import "RTCDispatcher+Private.h"
-
-@implementation RTCCameraPreviewView
-
-@synthesize captureSession = _captureSession;
-
-+ (Class)layerClass {
-  return [AVCaptureVideoPreviewLayer class];
-}
-
-- (void)setCaptureSession:(AVCaptureSession *)captureSession {
-  if (_captureSession == captureSession) {
-    return;
-  }
-  _captureSession = captureSession;
-  AVCaptureVideoPreviewLayer *previewLayer = [self previewLayer];
-  [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
-                               block:^{
-    previewLayer.session = captureSession;
-  }];
-}
-
-- (void)layoutSubviews {
-  [super layoutSubviews];
-
-  // Update the video orientation based on the device orientation.
-  [self setCorrectVideoOrientation];
-}
-
-- (void)setCorrectVideoOrientation {
-  // Get current device orientation.
-  UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
-  AVCaptureVideoPreviewLayer *previewLayer = [self previewLayer];
-
-  // First check if we are allowed to set the video orientation.
-  if (previewLayer.connection.isVideoOrientationSupported) {
-    // Set the video orientation based on device orientation.
-    if (deviceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
-      previewLayer.connection.videoOrientation =
-          AVCaptureVideoOrientationPortraitUpsideDown;
-    } else if (deviceOrientation == UIInterfaceOrientationLandscapeRight) {
-      previewLayer.connection.videoOrientation =
-          AVCaptureVideoOrientationLandscapeRight;
-    } else if (deviceOrientation == UIInterfaceOrientationLandscapeLeft) {
-      previewLayer.connection.videoOrientation =
-          AVCaptureVideoOrientationLandscapeLeft;
-    } else {
-      previewLayer.connection.videoOrientation =
-          AVCaptureVideoOrientationPortrait;
-    }
-  }
-}
-
-#pragma mark - Private
-
-- (AVCaptureVideoPreviewLayer *)previewLayer {
-  return (AVCaptureVideoPreviewLayer *)self.layer;
-}
-
-@end