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/Classes/RTCMediaConstraints.mm

@@ -0,0 +1,92 @@
+/*
+ *  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 "RTCMediaConstraints+Private.h"
+
+#import "NSString+StdString.h"
+
+namespace webrtc {
+
+MediaConstraints::~MediaConstraints() {}
+
+MediaConstraints::MediaConstraints() {}
+
+MediaConstraints::MediaConstraints(
+    const MediaConstraintsInterface::Constraints& mandatory,
+    const MediaConstraintsInterface::Constraints& optional)
+    : mandatory_(mandatory), optional_(optional) {}
+
+const MediaConstraintsInterface::Constraints&
+MediaConstraints::GetMandatory() const {
+  return mandatory_;
+}
+
+const MediaConstraintsInterface::Constraints&
+MediaConstraints::GetOptional() const {
+  return optional_;
+}
+
+}  // namespace webrtc
+
+
+@implementation RTCMediaConstraints {
+  NSDictionary<NSString *, NSString *> *_mandatory;
+  NSDictionary<NSString *, NSString *> *_optional;
+}
+
+- (instancetype)initWithMandatoryConstraints:
+    (NSDictionary<NSString *, NSString *> *)mandatory
+                         optionalConstraints:
+    (NSDictionary<NSString *, NSString *> *)optional {
+  if (self = [super init]) {
+    _mandatory = [[NSDictionary alloc] initWithDictionary:mandatory
+                                                copyItems:YES];
+    _optional = [[NSDictionary alloc] initWithDictionary:optional
+                                               copyItems:YES];
+  }
+  return self;
+}
+
+- (NSString *)description {
+  return [NSString stringWithFormat:@"RTCMediaConstraints:\n%@\n%@",
+                                    _mandatory,
+                                    _optional];
+}
+
+#pragma mark - Private
+
+- (rtc::scoped_ptr<webrtc::MediaConstraints>)nativeConstraints {
+  webrtc::MediaConstraintsInterface::Constraints mandatory =
+      [[self class] nativeConstraintsForConstraints:_mandatory];
+  webrtc::MediaConstraintsInterface::Constraints optional =
+      [[self class] nativeConstraintsForConstraints:_optional];
+
+  webrtc::MediaConstraints *nativeConstraints =
+      new webrtc::MediaConstraints(mandatory, optional);
+  return rtc::scoped_ptr<webrtc::MediaConstraints>(nativeConstraints);
+}
+
++ (webrtc::MediaConstraintsInterface::Constraints)
+    nativeConstraintsForConstraints:
+        (NSDictionary<NSString *, NSString *> *)constraints {
+  webrtc::MediaConstraintsInterface::Constraints nativeConstraints;
+  for (NSString *key in constraints) {
+    NSAssert([key isKindOfClass:[NSString class]],
+             @"%@ is not an NSString.", key);
+    NSString *value = [constraints objectForKey:key];
+    NSAssert([value isKindOfClass:[NSString class]],
+             @"%@ is not an NSString.", value);
+    nativeConstraints.push_back(webrtc::MediaConstraintsInterface::Constraint(
+        key.stdString, value.stdString));
+  }
+  return nativeConstraints;
+}
+
+@end