Initial commit for Chrome metainstaller on Mac.

chrome/installer/mac/app/OmahaCommunication.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_OMAHACOMMUNICATION_H_
+#define CHROME_INSTALLER_MAC_APP_OMAHACOMMUNICATION_H_
+
+#import <Foundation/Foundation.h>
+#include "NetworkCommunication.h"
+
+typedef void (^AfterBlock)(NSData*);

[Elly Fong-Jones, 2016/07/06 15:22:01]

OmahaRequestCompletionHandler?

+
+@interface OmahaCommunication : NSObject
+
+@property(nonatomic, copy) NSXMLDocument* requestXMLBody;
+@property(nonatomic, copy) NetworkCommunication* sessionHelper;
+
+- (id)init;
+- (id)initWithBody:(NSXMLDocument*) xmlBody;
+
+// Creates a new HTTP URL request to Omaha using the NetworkCommunication helper
+// and adjusts the URLRequest by changing the HTTP Method to "POST", which is

[Elly Fong-Jones, 2016/07/06 15:22:01]

This is an implementation detail. Also, is there a reason to expose the
NSURLRequest at all? Does the caller need to modify/etc it?

[Anna Zeng, 2016/07/07 15:24:53]

no, but it's a good idea to be able to verify if the request is valid... i was
thinking this would be useful for testing.

+// required to not get an error message.
+- (NSURLRequest*)createOmahaRequest;
+// Set how to respond to a response, including error handling and kicking off
+// the next block of code to run after the asynchronous jump.

[Elly Fong-Jones, 2016/07/06 15:22:01]

what asynchronous jump? This is setting the completion callback, right?

+- (void)setResponseHandlingWithBlock:(AfterBlock) block;
+// Sends the request created using the session helper.
+- (void)sendRequest;

[Elly Fong-Jones, 2016/07/06 15:22:01]

I would do sendRequestWithCompletionHandler: or something and avoid having
setResponseHandlingWithBlock:

+
+@end
+
+#endif // CHROME_INSTALLER_MAC_APP_OMAHACOMMUNICATION_H_