Adding the iOS app and integration example with GlRenderer.

remoting/client/ios/host_preferences.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "remoting/client/ios/host_preferences.h"
+
+#import "base/logging.h"
+
+namespace {
+static NSString* const kHostPreferencesDataKeyHostDictionary =
+    @"kHostPreferencesDataKeyHostDictionary";
+static NSString* const kHostPreferencesHostIdKey = @"HostId";
+static NSString* const kHostPreferencesPairIdKey = @"PairId";
+static NSString* const kHostPreferencesPairSecretKey = @"PairSecret";
+}  // namespace
+
+@interface HostPreferences ()
+
+// Load the known hosts from the Keychain.
+// If no data exists, return an empty dictionary
++ (NSMutableDictionary*)loadHosts;
+
+@end
+
+@implementation HostPreferences
+
+@synthesize hostId = _hostId;
+@synthesize pairId = _pairId;
+@synthesize pairSecret = _pairSecret;
+
+#pragma mark - Public
+
+- (void)saveToKeychain {
+  NSMutableDictionary* hosts = [HostPreferences loadHosts];
+  [hosts setObject:self forKey:_hostId];
+
+  NSData* writeData = [NSKeyedArchiver archivedDataWithRootObject:hosts];
+
+  NSError* keychainError =
+      remoting::ios::writeHostPreferencesToKeychain(writeData);
+
+  DLOG_IF(ERROR, !keychainError) << "Could not write to keychain.";
+}
+
++ (HostPreferences*)hostForId:(NSString*)hostId {
+  NSMutableDictionary* hosts = [HostPreferences loadHosts];
+  HostPreferences* host = hosts[hostId];
+  if (!host) {
+    host = [[HostPreferences alloc] init];
+    host.hostId = hostId;
+    host.pairId = @"";
+    host.pairSecret = @"";
+  }
+  return host;
+}
+
+#pragma mark - Private
+
++ (NSMutableDictionary*)loadHosts {
+  NSData* readData = remoting::ios::readHostPreferencesFromKeychain();
+  if (readData) {
+    return [NSKeyedUnarchiver unarchiveObjectWithData:readData];
+  } else {
+    return [[NSMutableDictionary alloc] init];
+  }
+}
+
+#pragma mark - NSCoding
+
+- (instancetype)initWithCoder:(NSCoder*)coder {
+  self = [super init];
+  if (self) {
+    [self setHostId:[coder decodeObjectForKey:kHostPreferencesHostIdKey]];
+    [self setPairId:[coder decodeObjectForKey:kHostPreferencesPairIdKey]];
+    [self
+        setPairSecret:[coder decodeObjectForKey:kHostPreferencesPairSecretKey]];
+  }
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder*)coder {
+  [coder encodeObject:_hostId forKey:kHostPreferencesHostIdKey];
+  [coder encodeObject:_pairId forKey:kHostPreferencesPairIdKey];
+  [coder encodeObject:_pairSecret forKey:kHostPreferencesPairSecretKey];
+}
+
+@end