Initial commit for Chrome metainstaller on Mac.

chrome/installer/mac/app/NetworkCommunication.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 CHROME_INSTALLER_MAC_APP_NETWORKCOMMUNICATION_H_
+#define CHROME_INSTALLER_MAC_APP_NETWORKCOMMUNICATION_H_
+
+#import <Foundation/Foundation.h>
+
+typedef void (^DataTaskCompletionHandler)(NSData*, NSURLResponse*, NSError*);
+typedef void (^DownloadTaskCompletionHandler)(NSURL*, NSURLResponse*, NSError*);
+
+@interface NetworkCommunication : NSObject
+
+@property(nonatomic, copy) NSMutableURLRequest* request;
+@property(nonatomic, copy) NSURLSession* session;
+@property(nonatomic, copy) DataTaskCompletionHandler dataResponseHandler;
+@property(nonatomic, copy) DownloadTaskCompletionHandler downloadResponseHandler;
+
+- (id)init;
+- (id)initWithDelegate:(id) delegate;
+
+// Creates a mutable URLRequest object as an instance variable, then returns it
+// so the caller has a chance to edit it before sending the request out.
+// Contrary to the assumption in Objective-C that all return values are returned
+// by VALUE, it seems that changes made to the returned object outside of this
+// class are retained.
+- (NSMutableURLRequest*)createRequestWithURLasString:(NSString*) urlString

[Mark Mentovai, 2016/07/07 17:53:48]

URLasString looks weird, like “UR Las String”. Consider changing the
capitalization to UrlAsString to make this easier to read.

+                                          andXMLBody:(NSXMLDocument*) body;
+// Adds a data task to the run loop using the request instance variable.
+- (void)sendDataRequestWithCompletionHandler:
+                (DataTaskCompletionHandler) completionHandler;
+// Adds a download task to the run loop using the request instance variable.
+- (void)sendDownloadRequest;
+
+@end
+
+#endif // CHROME_INSTALLER_MAC_APP_NETWORKCOMMUNICATION_H_