Makes construction of (ash)RemoteWindowTreeHostWin explicit

ash/host/ash_window_tree_host_x11.cc

 // Copyright 2014 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.
 
 #include "ash/host/ash_window_tree_host_x11.h"
 
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 
 #include <string>
 #include <vector>
 
+#include "ash/host/ash_window_tree_host_init_params.h"
 #include "ash/host/root_window_transformer.h"
 #include "base/basictypes.h"
 #include "base/sys_info.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/x/device_data_manager.h"
@@ skipping 249 matching lines @@
                        prop,
                        XA_INTEGER,
                        8,
                        PropModeReplace,
                        &value,
                        1);
     }
   }
 }
 
-AshWindowTreeHost* AshWindowTreeHost::Create(const gfx::Rect& initial_bounds) {
-  return new AshWindowTreeHostX11(initial_bounds);
+AshWindowTreeHost* AshWindowTreeHost::Create(
+    const AshWindowTreeHostInitParams& init_params) {
+  return new AshWindowTreeHostX11(init_params.initial_bounds);
 }
 
 }  // namespace ash