Initial commit for Chrome metainstaller on Mac.

chrome/installer/mac/app/DownloadDelegate.m

+// 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.
+
+#import "DownloadDelegate.h"
+#import "downloader.h"
+
+@implementation DownloadDelegate : NSObject
+
+// Skeleton of delegate method to provide download progress updates.
+// TODO: Make use of (totalBytesWritten/totalBytesExpectedToWrite)*100
+// to generate download progress percentage.
+- (void)URLSession:(NSURLSession*)session
+      downloadTask:(NSURLSessionDownloadTask*)downloadTask
+      didWriteData:(int64_t)bytesWritten
+ totalBytesWritten:(int64_t)totalBytesWritten
+totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{
+
+}
+
+// Delegate method to move downloaded disk image to user's Download directory.
+- (void)URLSession:(NSURLSession*)session
+      downloadTask:(NSURLSessionDownloadTask*)downloadTask
+didFinishDownloadingToURL:(NSURL*)location{
+  NSFileManager* manager = [[NSFileManager alloc] init];

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

Background reading on scoped_nsobject<>, although you guys can use ARC:
http://an.enduringcolumn.com/2011/05/bilingual-memory-management.html.

+  NSString* temporaryDownloadDirectory = [NSString stringWithFormat:@"%@",

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

location.path should give you an NSString*, you don’t need to use
-stringWithFormat:.

Is this really a directory? It’s named as a directory, but that seems weird.

Should we make sure that the NSURL is a file URL (isFileURL) before doing this?

+                                          location.path];
+  NSURL* downloadsDirectory = [[NSURL alloc] initFileURLWithPath:[Downloader
+                                                                  getDownloadsFilePath]];
+  if ( [manager fileExistsAtPath:temporaryDownloadDirectory] ){
+    [manager copyItemAtURL:location toURL:downloadsDirectory error:nil];

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

What happens to the original temporary copy?

+    NSLog(@"File was downloaded to Downloads.");

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

We shouldn’t check in logging like this.

+  } else {
+    // TODO: Error Handling
+  }
+
+}
+
+- (void)URLSession:(NSURLSession *)session
+              task:(NSURLSessionTask *)task
+didCompleteWithError:(NSError *)error{
+  // TODO: Error Handling
+}
+@end
+