Make application shortcuts point to app_host.exe, install App Host during app installation.

chrome/browser/extensions/unpacked_installer.h

 // Copyright (c) 2012 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_BROWSER_EXTENSIONS_UNPACKED_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_UNPACKED_INSTALLER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/extensions/app_host_installer.h"
 
 class ExtensionService;
 
 namespace extensions {
 
 class Extension;
 class RequirementsChecker;
 
 // Installs and loads an unpacked extension. Because internal state needs to be
 // held about the instalation process, only one call to Load*() should be made
@@ skipping 55 matching lines @@
   void GetAbsolutePath();
   void CheckExtensionFileAccess();
   void LoadWithFileAccess(int flags);
 
   // Notify the frontend that there was an error loading an extension.
   void ReportExtensionLoadError(const std::string& error);
 
   // Called when an unpacked extension has been loaded and installed.
   void OnLoaded();
 
+  // Called when user commits to intalling an app.
+  void OnPromptAccepted();
+
+  // Runs on File thread. Ensures that App Host is installed, and then

[benwells, 2012/10/04 07:53:01]

Nit: File -> FILE

[huangs, 2012/10/04 22:56:42]

Done (for the file).

+  // proceeds to post CompleteExtensionInstall().
+  void BeginInstall();
+
+  // Callback function for AppHostInstaller.
+  void OnAppHostInstallation(bool success);
+
+  // Runs on File thread. Installs the unpacked extension into the profile and

[benwells, 2012/10/04 07:53:01]

Nit: File -> FILE

[huangs, 2012/10/04 22:56:42]

Done.

+  // notifies the frontend.
+  void CompleteInstall();
+
   // Helper to get the Extension::CreateFlags for the installing extension.
   int GetFlags();
 
   base::WeakPtr<ExtensionService> service_weak_;
 
   // The pathname of the directory to load from, which is an absolute path
   // after GetAbsolutePath has been called.
   FilePath extension_path_;
 
   // If true and the extension contains plugins, we prompt the user before
   // loading.
   bool prompt_for_plugins_;
 
   scoped_ptr<RequirementsChecker> requirements_checker_;
 
   scoped_refptr<const Extension> extension_;
 
   // Whether to require the extension installed to have a modern manifest
   // version.
   bool require_modern_manifest_version_;
 
+  // Helper to install App Host.
+  AppHostInstaller app_host_installer_;
+
   DISALLOW_COPY_AND_ASSIGN(UnpackedInstaller);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_UNPACKED_INSTALLER_H_