Wires up view manager to an actual display

ui/aura/window_tree_host.cc

 // Copyright (c) 2013 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 "ui/aura/window_tree_host.h"
 
 #include "base/debug/trace_event.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/env.h"
@@ skipping 160 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowTreeHost, protected:
 
 WindowTreeHost::WindowTreeHost()
     : window_(new Window(NULL)),
       last_cursor_(ui::kCursorNull) {
 }
 
 void WindowTreeHost::DestroyCompositor() {
-  DCHECK(GetAcceleratedWidget());
   compositor_.reset();
 }
 
 void WindowTreeHost::DestroyDispatcher() {
   delete window_;
   window_ = NULL;
   dispatcher_.reset();
 
   // TODO(beng): this comment is no longer quite valid since this function
   // isn't called from WED, and WED isn't a subclass of Window. So it seems
@@ skipping 70 matching lines @@
   client::CursorClient* cursor_client = client::GetCursorClient(window());
   if (cursor_client) {
     const gfx::Display& display =
         gfx::Screen::GetScreenFor(window())->GetDisplayNearestWindow(window());
     cursor_client->SetDisplay(display);
   }
   dispatcher()->OnCursorMovedToRootLocation(root_location);
 }
 
 }  // namespace aura