views/mus: Create the BitmapUploader only when needed.

ui/views/mus/native_widget_mus.h

Index: ui/views/mus/native_widget_mus.h
diff --git a/ui/views/mus/native_widget_mus.h b/ui/views/mus/native_widget_mus.h
index e2b188a4b2136585cbe60b6382c0a2dceb887ada..33da5378358e1cc3cbb3d1b975ea63e7f065474c 100644
--- a/ui/views/mus/native_widget_mus.h
+++ b/ui/views/mus/native_widget_mus.h
@@ -32,6 +32,10 @@ class WindowTreeClient;
 class Window;
 }
 
+namespace bitmap_uploader {
+class BitmapUploader;
+}
+
 namespace mus {
 class Window;
 class WindowTreeClient;
@@ -47,6 +51,7 @@ class Connector;
 
 namespace ui {
 class Event;
+class ViewProp;
 }
 
 namespace wm {
@@ -268,6 +273,11 @@ private:
   std::unique_ptr<aura::client::WindowTreeClient> window_tree_client_;
   std::unique_ptr<aura::client::ScreenPositionClient> screen_position_client_;
   std::unique_ptr<wm::CursorManager> cursor_manager_;
+
+  // Bitmap management.
+  std::unique_ptr<bitmap_uploader::BitmapUploader> bitmap_uploader_;
+  std::unique_ptr<ui::ViewProp> prop_;
+
   base::WeakPtrFactory<NativeWidgetMus> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetMus);