[CRD iOS] Implementing save to keychain and user defaults for login info. Refactor remoting service.

remoting/client/ios/domain/host_info.h

 // 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.
 
 #ifndef REMOTING_CLIENT_IOS_DOMAIN_HOST_INFO_H_
 #define REMOTING_CLIENT_IOS_DOMAIN_HOST_INFO_H_
 
 #import <Foundation/Foundation.h>
 
 // A detail record for a Remoting Host.
 @interface HostInfo : NSObject
 
 // Various properties of the Remoting Host.
 @property(nonatomic, copy) NSString* createdTime;
 @property(nonatomic, copy) NSString* hostId;
 @property(nonatomic, copy) NSString* hostName;
 @property(nonatomic, copy) NSString* hostVersion;
 @property(nonatomic, copy) NSString* jabberId;
 @property(nonatomic, copy) NSString* kind;
 @property(nonatomic, copy) NSString* publicKey;
 @property(nonatomic, copy) NSString* status;
 @property(nonatomic, copy) NSDate* updatedTime;
 // True when |status| is @"ONLINE", anything else is False.
 @property(nonatomic, readonly) bool isOnline;
 
+// Convert a json blob into a |HostInfo| object. Most useful for test.
+// TODO(nicholss): Might move this out into a catagory.
 + (NSMutableArray<HostInfo*>*)parseListFromJSON:(NSMutableData*)data;
 
 // First consider if |isOnline| is greater than anything else, then consider by
 // case insensitive locale of |hostName|.
 - (NSComparisonResult)compare:(HostInfo*)host;
 
 @end
 
 #endif  //  REMOTING_CLIENT_IOS_DOMAIN_HOST_INFO_H_