Initial commit for Chrome metainstaller on Mac.

chrome/installer/mac/app/Downloader.h

Index: chrome/installer/mac/app/Downloader.h
diff --git a/chrome/installer/mac/app/Downloader.h b/chrome/installer/mac/app/Downloader.h
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+++ b/chrome/installer/mac/app/Downloader.h
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+// 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_DOWNLOADER_H_
+#define CHROME_INSTALLER_MAC_APP_DOWNLOADER_H_
+
+#import <Foundation/Foundation.h>
+
+@interface Downloader : NSObject<NSXMLParserDelegate>
+
+// Returns a path to a user's home download folder.
++ (NSString*)getDownloadsFilePath;
+
+- (NSMutableArray*)appendFilename:(NSString*)filename
+                           toURLs:(NSArray*)incompleteURLs;
+
+// Takes an NSData with a response XML from Omaha and writes the latest
+// version of chrome to the user's download directory.
+- (BOOL)downloadChromeImageToDownloadsDirectory:(NSData*)omahaResponseXML;
+
+@end
+
+#endif  // CHROME_INSTALLER_MAC_APP_DOWNLOADER_H_