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/unittests/RTCIceCandidateTest.mm b/sdk/objc/unittests/RTCIceCandidateTest.mm
new file mode 100644
index 0000000..18dcdad
--- /dev/null
+++ b/sdk/objc/unittests/RTCIceCandidateTest.mm
@@ -0,0 +1,76 @@
+/*
+ *  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>
+
+#include <memory>
+
+#include "rtc_base/gunit.h"
+
+#import "api/peerconnection/RTCIceCandidate+Private.h"
+#import "api/peerconnection/RTCIceCandidate.h"
+#import "helpers/NSString+StdString.h"
+
+@interface RTCIceCandidateTest : NSObject
+- (void)testCandidate;
+- (void)testInitFromNativeCandidate;
+@end
+
+@implementation RTCIceCandidateTest
+
+- (void)testCandidate {
+  NSString *sdp = @"candidate:4025901590 1 udp 2122265343 "
+                   "fdff:2642:12a6:fe38:c001:beda:fcf9:51aa "
+                   "59052 typ host generation 0";
+
+  RTCIceCandidate *candidate = [[RTCIceCandidate alloc] initWithSdp:sdp
+                                                      sdpMLineIndex:0
+                                                             sdpMid:@"audio"];
+
+  std::unique_ptr<webrtc::IceCandidateInterface> nativeCandidate =
+      candidate.nativeCandidate;
+  EXPECT_EQ("audio", nativeCandidate->sdp_mid());
+  EXPECT_EQ(0, nativeCandidate->sdp_mline_index());
+
+  std::string sdpString;
+  nativeCandidate->ToString(&sdpString);
+  EXPECT_EQ(sdp.stdString, sdpString);
+}
+
+- (void)testInitFromNativeCandidate {
+  std::string sdp("candidate:4025901590 1 udp 2122265343 "
+                  "fdff:2642:12a6:fe38:c001:beda:fcf9:51aa "
+                  "59052 typ host generation 0");
+  webrtc::IceCandidateInterface *nativeCandidate =
+      webrtc::CreateIceCandidate("audio", 0, sdp, nullptr);
+
+  RTCIceCandidate *iceCandidate =
+      [[RTCIceCandidate alloc] initWithNativeCandidate:nativeCandidate];
+  EXPECT_TRUE([@"audio" isEqualToString:iceCandidate.sdpMid]);
+  EXPECT_EQ(0, iceCandidate.sdpMLineIndex);
+
+  EXPECT_EQ(sdp, iceCandidate.sdp.stdString);
+}
+
+@end
+
+TEST(RTCIceCandidateTest, CandidateTest) {
+  @autoreleasepool {
+    RTCIceCandidateTest *test = [[RTCIceCandidateTest alloc] init];
+    [test testCandidate];
+  }
+}
+
+TEST(RTCIceCandidateTest, InitFromCandidateTest) {
+  @autoreleasepool {
+    RTCIceCandidateTest *test = [[RTCIceCandidateTest alloc] init];
+    [test testInitFromNativeCandidate];
+  }
+}