Add ash devtools client

ash/common/wm_shell.h

Index: ash/common/wm_shell.h
diff --git a/ash/common/wm_shell.h b/ash/common/wm_shell.h
index 0a09d084b1a5a2e6a8ebff1d85b1b30003dbf6cc..0cc58e287266b83868e50f0f5428b2fd91e58d42 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -18,6 +18,7 @@
 #include "base/observer_list.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/layer_type.h"
+#include "ui/devtools/devtools_server.h"
 #include "ui/wm/public/window_types.h"
 
 namespace base {
@@ -460,6 +461,7 @@ class ASH_EXPORT WmShell {
   std::unique_ptr<WallpaperDelegate> wallpaper_delegate_;
   std::unique_ptr<WindowCycleController> window_cycle_controller_;
   std::unique_ptr<WindowSelectorController> window_selector_controller_;
+  std::unique_ptr<ui::devtools::UiDevToolsServer> devtools_server_;
 
   base::ObserverList<LockStateObserver> lock_state_observers_;