Added unpacking step

chrome/installer/mac/app/Unpacker.h

Index: chrome/installer/mac/app/Unpacker.h
diff --git a/chrome/installer/mac/app/Unpacker.h b/chrome/installer/mac/app/Unpacker.h
new file mode 100644
index 0000000000000000000000000000000000000000..0dd8df5ae364b78198ee7acd6c650dbe20b96ad3
--- /dev/null
+++ b/chrome/installer/mac/app/Unpacker.h
@@ -0,0 +1,35 @@
+// 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_UNPACKER_H_
+#define CHROME_INSTALLER_MAC_APP_UNPACKER_H_
+
+#import <Foundation/Foundation.h>
+
+@class Unpacker;
+@protocol UnpackDelegate
+- (void)unpacker:(Unpacker*)unpacker onSuccess:(NSString*)appPath;
+- (void)unpacker:(Unpacker*)unpacker onFailure:(NSError*)error;
+- (void)unpacker:(Unpacker*)unpacker onUnmountSuccess:(NSString*)mountpath;
+- (void)unpacker:(Unpacker*)unpacker onUnmountFailure:(NSError*)error;
+@optional
+- (void)unpacker:(Unpacker*)unpacker onMountSuccess:(NSString*)mountpath;
+- (void)unpacker:(Unpacker*)unpacker onMountFailure:(NSError*)error;
+@end
+
+@interface Unpacker : NSObject
+
+@property(nonatomic, assign) NSObject<UnpackDelegate>* delegate;

[Sidney San Martín, 2016/08/17 22:09:06]

Instead of this, you can just declare your delegate protocol like this:

    @protocol UnpackDelegate : NSObject
    …
    @end

[Sidney San Martín, 2016/08/18 19:33:00]

Just for posterity…

I got the syntax wrong (by mixing in some Swift). It's actually:

     @protocol UnpackDelegate<NSObject>
     …
     @end

[Anna Zeng, 2016/08/18 19:41:09]

Done

+@property(nonatomic, copy) NSString* appPath;
+
+- (id)initWithFinalAppPath:(NSString*)appPath;
+
+// TODO: add a new "extractor" class to be nested into unpacker
+- (void)mountDMGFromURL:(NSURL*)fileURL;
+- (void)extractChrome;
+- (void)unmountDMG;
+
+@end
+
+#endif  // CHROME_INSTALLER_MAC_APP_UNPACKER_H_