Makes WindowTreeHostMus supply properties directly to window creation

ui/aura/mus/window_tree_host_mus_delegate.h

 // Copyright 2016 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 UI_AURA_MUS_WINDOW_TREE_HOST_MUS_DELEGATE_H_
 #define UI_AURA_MUS_WINDOW_TREE_HOST_MUS_DELEGATE_H_
 
+#include <stdint.h>
+
+#include <map>
+#include <string>
+#include <vector>
+
 #include "ui/aura/aura_export.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace aura {
 
 class WindowPortMus;
 class WindowTreeHostMus;
@@ skipping 12 matching lines @@
       WindowTreeHostMus* window_tree_host,
       const gfx::Insets& client_area,
       const std::vector<gfx::Rect>& additional_client_areas) = 0;
 
   // Called when the hit test mask is about to be cleared.
   virtual void OnWindowTreeHostHitTestMaskWillChange(
       WindowTreeHostMus* window_tree_host,
       const base::Optional<gfx::Rect>& mask_rect) = 0;
 
   // Called when a WindowTreeHostMus is created without a WindowPort.
-  virtual std::unique_ptr<WindowPortMus> CreateWindowPortForTopLevel() = 0;
+  // TODO: this should take an unordered_map, see http://crbug.com/670515.
+  virtual std::unique_ptr<WindowPortMus> CreateWindowPortForTopLevel(
+      const std::map<std::string, std::vector<uint8_t>>* properties) = 0;
 
   // Called from WindowTreeHostMus's constructor once the Window has been
   // created.
   virtual void OnWindowTreeHostCreated(WindowTreeHostMus* window_tree_host) = 0;
 
  protected:
   virtual ~WindowTreeHostMusDelegate() {}
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_WINDOW_TREE_HOST_MUS_DELEGATE_H_