Implemented on-demand installation of the Chromoting Host on Windows.

remoting/host/plugin/daemon_installer_win.h

Index: remoting/host/plugin/daemon_installer_win.h
diff --git a/remoting/host/plugin/daemon_installer_win.h b/remoting/host/plugin/daemon_installer_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..5a7286d2ba83887b60dd4fb88c2d81c2b41ba0cc
--- /dev/null
+++ b/remoting/host/plugin/daemon_installer_win.h
@@ -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.
+
+#ifndef REMOTING_HOST_DAEMON_INSTALLER_WIN_H_
+#define REMOTING_HOST_DAEMON_INSTALLER_WIN_H_
+
+#include <objbase.h>
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/memory/scoped_ptr.h"
+#include "remoting/host/plugin/daemon_controller.h"
+
+namespace remoting {
+
+class DaemonInstallerWin {
+ public:
+  virtual ~DaemonInstallerWin();
+
+  typedef base::Callback<void (HRESULT result)> CompletionCallback;
+
+  // Initiates download and installation of the Chromoting Host. |done|
+  // is invoked once installation completes successfully or fails for any
+  // reason. |self| is passed to keep a reference to itself while installation
+  // is in progress.
+  virtual void Install(const CompletionCallback& done) = 0;
+
+  // Creates an instance of the Chromoting Host installer.
+  static HRESULT Create(scoped_ptr<DaemonInstallerWin>* installer_out);
+
+ protected:
+  DaemonInstallerWin();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DaemonInstallerWin);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_DAEMON_INSTALLER_WIN_H_