Add window manager component.

wm/host/foreign_test_window_host.h

Index: wm/host/foreign_test_window_host.h
diff --git a/wm/host/foreign_test_window_host.h b/wm/host/foreign_test_window_host.h
new file mode 100644
index 0000000000000000000000000000000000000000..d7ab85ac0c8606afdfe261829a4d9eccd551bd26
--- /dev/null
+++ b/wm/host/foreign_test_window_host.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2013 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 WM_HOST_FOREIGN_TEST_WINDOW_HOST_H_
+#define WM_HOST_FOREIGN_TEST_WINDOW_HOST_H_
+
+namespace aura {
+class RootWindow;
+}
+
+namespace wm {
+
+class ForeignTestWindowHost {
+ public:
+  virtual ~ForeignTestWindowHost() {}
+
+  // Creates a new ForeignTestWindowHost. Caller owns return value and must
+  // call Destroy() to delete instance.
+  static ForeignTestWindowHost* Create(aura::RootWindow* root_window);
+
+  // This is guaranteed to run all tasks up to the last Sync() call.
+  static void RunAllPendingInMessageLoop();
+
+  // These functions should only be called on a thread with an IO message loop.
+  virtual void Initialize() = 0;
+  virtual void Delete() = 0;
+  virtual void Show() = 0;
+  virtual void Hide() = 0;
+  virtual void Destroy() = 0;
+  virtual void Sync() = 0;
+};
+
+}  // namespace wm
+
+#endif  // WM_HOST_FOREIGN_TEST_WINDOW_HOST_H_