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

chrome/browser/extensions/app_host_installer.cc

Index: chrome/browser/extensions/app_host_installer.cc
diff --git a/chrome/browser/extensions/app_host_installer.cc b/chrome/browser/extensions/app_host_installer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..07ac5c92db9cb74f2dc26dffb3fd19ea80891781
--- /dev/null
+++ b/chrome/browser/extensions/app_host_installer.cc
@@ -0,0 +1,41 @@
+// 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.
+
+#include "chrome/browser/extensions/app_host_installer.h"
+
+#include "base/bind.h"

[erikwright (departed), 2012/10/05 21:18:23]

not required.

[huangs, 2012/10/07 01:42:25]

Done.

+#include "base/callback.h"
+#include "base/compiler_specific.h"

[erikwright (departed), 2012/10/05 21:18:23]

not required

[huangs, 2012/10/07 01:42:25]

Done.

+#include "chrome/common/extensions/extension.h"

[erikwright (departed), 2012/10/05 21:18:23]

not required

[huangs, 2012/10/07 01:42:25]

Done (forward declared).

+
+#if defined(OS_WIN)
+#include "chrome/browser/extensions/app_host_installer_impl_win.h"
+#endif
+
+namespace extensions {
+
+AppHostInstaller::AppHostInstaller()
+    :
+#if defined(OS_WIN)
+      impl_(new AppHostInstallerImpl()) {}
+#else
+      impl_(0) {}
+#endif
+
+AppHostInstaller::~AppHostInstaller() {
+  if (impl_)
+    delete impl_;
+}
+
+void AppHostInstaller::InstallAppHostIfNecessary(
+    const Extension& extension,
+    const base::Callback<void(bool)>& completion_callback) {
+#if defined(OS_WIN)
+  impl_->InstallAppHostIfNecessary(extension, completion_callback);
+#else
+  completion_callback.Run(true);
+#endif
+}
+
+}  // namespace extensions