Add window manager component.

wm/shell/shell_main_parts.h

Index: wm/shell/shell_main_parts.h
diff --git a/ash/shell/shell_main_parts.h b/wm/shell/shell_main_parts.h
similarity index 67%
copy from ash/shell/shell_main_parts.h
copy to wm/shell/shell_main_parts.h
index c0452e95d31d3007554aca54f6145591f63b5b2f..9388c6a5c38bedc85a1ad804b8e0b74c1f43fdea 100644
--- a/ash/shell/shell_main_parts.h
+++ b/wm/shell/shell_main_parts.h
@@ -2,16 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SHELL_SHELL_MAIN_PARTS_H_
-#define ASH_SHELL_SHELL_MAIN_PARTS_H_
+#ifndef WM_SHELL_SHELL_MAIN_PARTS_H_
+#define WM_SHELL_SHELL_MAIN_PARTS_H_
 
-namespace ash {
+namespace wm {
 namespace shell {
 
 // Platform initializations prior to the start of the main message loop.
 void PreMainMessageLoopStart();
 
 }  // namespace shell
-}  // namespace ash
+}  // namespace wm
 
-#endif  // ASH_SHELL_SHELL_MAIN_PARTS_H_
+#endif  // WM_SHELL_SHELL_MAIN_PARTS_H_