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

chrome/browser/extensions/app_host_installer.h

Index: chrome/browser/extensions/app_host_installer.h
diff --git a/chrome/browser/extensions/app_host_installer.h b/chrome/browser/extensions/app_host_installer.h
new file mode 100644
index 0000000000000000000000000000000000000000..6df7339fd872ed7dbf9562f4b5253f49b580bf76
--- /dev/null
+++ b/chrome/browser/extensions/app_host_installer.h
@@ -0,0 +1,42 @@
+// 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_APP_HOST_INSTALLER_H_
+#define CHROME_BROWSER_EXTENSIONS_APP_HOST_INSTALLER_H_
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/win/object_watcher.h"

[erikwright (departed), 2012/10/04 01:28:16]

You'll need #if's for base/win/*

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

You also don't need to include scoped_ptr unless it's win.

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

Done.

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

Done.

+#include "base/win/scoped_handle.h"
+
+namespace extensions {
+
+class Extension;
+
+class AppHostInstaller {
+ public:
+  AppHostInstaller();
+
+  // Returns true if App Host needs to be installed, for the given |extension|.
+  static bool IsAppHostInstallRequired(const Extension& extension);

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

If these functions need to be called on the FILE thread, please mention it.

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

Done.

+
+  // Installs App Host, then calls |callback| to proceed with installation.
+  // |callback| is a function that takes a bool parameter to indicate
+  // whether or not the App Host installation was successful.
+  void InstallAppHost(const base::Callback<void(bool)>& callback);
+
+ private:
+#if defined(OS_WIN)
+  base::win::ScopedHandle process_;
+  base::win::ObjectWatcher watcher_;
+  scoped_ptr<base::win::ObjectWatcher::Delegate> delegate_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(AppHostInstaller);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_APP_HOST_INSTALLER_H_