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..aeac8299720b9f14ef3b8966d84f0ecc6b62e4b1
--- /dev/null
+++ b/remoting/host/plugin/daemon_installer_win.h
@@ -0,0 +1,47 @@
+// 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.h"
+#include "base/memory/scoped_ptr.h"
+#include "remoting/host/plugin/daemon_controller.h"
+
+namespace remoting {
+
+class DaemonInstallerWin {
+ public:
+  typedef base::Callback<void (HRESULT result)> CompletionCallback;
+
+  virtual ~DaemonInstallerWin();
+
+  // Initiates download and installation of the Chromoting Host.
+  virtual void Install() = 0;
+
+  // Creates an instance of the Chromoting Host installer passing the completion
+  // callback to be called when the installation finishes. In case of an error
+  // returns NULL and passed the error code to |done|.
+  static scoped_ptr<DaemonInstallerWin> Create(CompletionCallback done);
+
+ protected:
+  DaemonInstallerWin(const CompletionCallback& done);
+
+  // Invokes the completion callback to report the installation result.
+  void Done(HRESULT result);
+
+ private:
+  // The completion callback that should be called to report the installation
+  // result.
+  CompletionCallback done_;
+
+  DISALLOW_COPY_AND_ASSIGN(DaemonInstallerWin);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_DAEMON_INSTALLER_WIN_H_