Obj-C SDK Cleanup

This CL separates the files under sdk/objc into logical directories, replacing
the previous file layout under Framework/.

A long term goal is to have some system set up to generate the files under
sdk/objc/api (the PeerConnection API wrappers) from the C++ code. In the shorter
term the goal is to abstract out shared concepts from these classes in order to
make them as uniform as possible.

The separation into base/, components/, and helpers/ are to differentiate between
the base layer's common protocols, various utilities and the actual platform
specific components.

The old directory layout that resembled a framework's internal layout is not
necessary, since it is generated by the framework target when building it.

Bug: webrtc:9627
Change-Id: Ib084fd83f050ae980649ca99e841f4fb0580bd8f
Reviewed-on: https://webrtc-review.googlesource.com/94142
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24493}
diff --git a/sdk/objc/helpers/UIDevice+RTCDevice.mm b/sdk/objc/helpers/UIDevice+RTCDevice.mm
new file mode 100644
index 0000000..96adb9a
--- /dev/null
+++ b/sdk/objc/helpers/UIDevice+RTCDevice.mm
@@ -0,0 +1,120 @@
+/*
+ *  Copyright 2016 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 "UIDevice+RTCDevice.h"
+
+#import <sys/utsname.h>
+#include <memory>
+
+@implementation UIDevice (RTCDevice)
+
++ (RTCDeviceType)deviceType {
+  NSDictionary *machineNameToType = @{
+    @"iPhone1,1": @(RTCDeviceTypeIPhone1G),
+    @"iPhone1,2": @(RTCDeviceTypeIPhone3G),
+    @"iPhone2,1": @(RTCDeviceTypeIPhone3GS),
+    @"iPhone3,1": @(RTCDeviceTypeIPhone4),
+    @"iPhone3,2": @(RTCDeviceTypeIPhone4),
+    @"iPhone3,3": @(RTCDeviceTypeIPhone4Verizon),
+    @"iPhone4,1": @(RTCDeviceTypeIPhone4S),
+    @"iPhone5,1": @(RTCDeviceTypeIPhone5GSM),
+    @"iPhone5,2": @(RTCDeviceTypeIPhone5GSM_CDMA),
+    @"iPhone5,3": @(RTCDeviceTypeIPhone5CGSM),
+    @"iPhone5,4": @(RTCDeviceTypeIPhone5CGSM_CDMA),
+    @"iPhone6,1": @(RTCDeviceTypeIPhone5SGSM),
+    @"iPhone6,2": @(RTCDeviceTypeIPhone5SGSM_CDMA),
+    @"iPhone7,1": @(RTCDeviceTypeIPhone6Plus),
+    @"iPhone7,2": @(RTCDeviceTypeIPhone6),
+    @"iPhone8,1": @(RTCDeviceTypeIPhone6S),
+    @"iPhone8,2": @(RTCDeviceTypeIPhone6SPlus),
+    @"iPhone8,4": @(RTCDeviceTypeIPhoneSE),
+    @"iPhone9,1": @(RTCDeviceTypeIPhone7),
+    @"iPhone9,2": @(RTCDeviceTypeIPhone7Plus),
+    @"iPhone9,3": @(RTCDeviceTypeIPhone7),
+    @"iPhone9,4": @(RTCDeviceTypeIPhone7Plus),
+    @"iPhone10,1": @(RTCDeviceTypeIPhone8),
+    @"iPhone10,2": @(RTCDeviceTypeIPhone8Plus),
+    @"iPhone10,3": @(RTCDeviceTypeIPhoneX),
+    @"iPhone10,4": @(RTCDeviceTypeIPhone8),
+    @"iPhone10,5": @(RTCDeviceTypeIPhone8Plus),
+    @"iPhone10,6": @(RTCDeviceTypeIPhoneX),
+    @"iPod1,1": @(RTCDeviceTypeIPodTouch1G),
+    @"iPod2,1": @(RTCDeviceTypeIPodTouch2G),
+    @"iPod3,1": @(RTCDeviceTypeIPodTouch3G),
+    @"iPod4,1": @(RTCDeviceTypeIPodTouch4G),
+    @"iPod5,1": @(RTCDeviceTypeIPodTouch5G),
+    @"iPod7,1": @(RTCDeviceTypeIPodTouch6G),
+    @"iPad1,1": @(RTCDeviceTypeIPad),
+    @"iPad2,1": @(RTCDeviceTypeIPad2Wifi),
+    @"iPad2,2": @(RTCDeviceTypeIPad2GSM),
+    @"iPad2,3": @(RTCDeviceTypeIPad2CDMA),
+    @"iPad2,4": @(RTCDeviceTypeIPad2Wifi2),
+    @"iPad2,5": @(RTCDeviceTypeIPadMiniWifi),
+    @"iPad2,6": @(RTCDeviceTypeIPadMiniGSM),
+    @"iPad2,7": @(RTCDeviceTypeIPadMiniGSM_CDMA),
+    @"iPad3,1": @(RTCDeviceTypeIPad3Wifi),
+    @"iPad3,2": @(RTCDeviceTypeIPad3GSM_CDMA),
+    @"iPad3,3": @(RTCDeviceTypeIPad3GSM),
+    @"iPad3,4": @(RTCDeviceTypeIPad4Wifi),
+    @"iPad3,5": @(RTCDeviceTypeIPad4GSM),
+    @"iPad3,6": @(RTCDeviceTypeIPad4GSM_CDMA),
+    @"iPad4,1": @(RTCDeviceTypeIPadAirWifi),
+    @"iPad4,2": @(RTCDeviceTypeIPadAirCellular),
+    @"iPad4,3": @(RTCDeviceTypeIPadAirWifiCellular),
+    @"iPad4,4": @(RTCDeviceTypeIPadMini2GWifi),
+    @"iPad4,5": @(RTCDeviceTypeIPadMini2GCellular),
+    @"iPad4,6": @(RTCDeviceTypeIPadMini2GWifiCellular),
+    @"iPad4,7": @(RTCDeviceTypeIPadMini3),
+    @"iPad4,8": @(RTCDeviceTypeIPadMini3),
+    @"iPad4,9": @(RTCDeviceTypeIPadMini3),
+    @"iPad5,1": @(RTCDeviceTypeIPadMini4),
+    @"iPad5,2": @(RTCDeviceTypeIPadMini4),
+    @"iPad5,3": @(RTCDeviceTypeIPadAir2),
+    @"iPad5,4": @(RTCDeviceTypeIPadAir2),
+    @"iPad6,3": @(RTCDeviceTypeIPadPro9Inch),
+    @"iPad6,4": @(RTCDeviceTypeIPadPro9Inch),
+    @"iPad6,7": @(RTCDeviceTypeIPadPro12Inch),
+    @"iPad6,8": @(RTCDeviceTypeIPadPro12Inch),
+    @"iPad6,11": @(RTCDeviceTypeIPad5),
+    @"iPad6,12": @(RTCDeviceTypeIPad5),
+    @"iPad7,1": @(RTCDeviceTypeIPadPro12Inch2),
+    @"iPad7,2": @(RTCDeviceTypeIPadPro12Inch2),
+    @"iPad7,3": @(RTCDeviceTypeIPadPro10Inch),
+    @"iPad7,4": @(RTCDeviceTypeIPadPro10Inch),
+    @"iPad7,5": @(RTCDeviceTypeIPad6),
+    @"iPad7,6": @(RTCDeviceTypeIPad6),
+    @"i386": @(RTCDeviceTypeSimulatori386),
+    @"x86_64": @(RTCDeviceTypeSimulatorx86_64),
+  };
+
+  RTCDeviceType deviceType = RTCDeviceTypeUnknown;
+  NSNumber *typeNumber = machineNameToType[[self machineName]];
+  if (typeNumber) {
+    deviceType = static_cast<RTCDeviceType>(typeNumber.integerValue);
+  }
+  return deviceType;
+}
+
++ (NSString *)machineName {
+  struct utsname systemInfo;
+  uname(&systemInfo);
+  return [[NSString alloc] initWithCString:systemInfo.machine
+                                  encoding:NSUTF8StringEncoding];
+}
+
++ (double)currentDeviceSystemVersion {
+  return [self currentDevice].systemVersion.doubleValue;
+}
+
++ (BOOL)isIOS11OrLater {
+  return [self currentDeviceSystemVersion] >= 11.0;
+}
+
+@end