Defer app window appearance until first paint.

chrome/browser/extensions/api/app_window/app_window_api.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/app_window/app_window_api.h"
 
 #include "apps/app_window_contents.h"
 #include "apps/shell_window.h"
 #include "apps/shell_window_registry.h"
 #include "apps/ui/native_app_window.h"
@@ skipping 154 matching lines @@
                                                       create_params.window_key);
         if (window) {
           content::RenderViewHost* created_view =
               window->web_contents()->GetRenderViewHost();
           int view_id = MSG_ROUTING_NONE;
           if (render_view_host_->GetProcess()->GetID() ==
               created_view->GetProcess()->GetID()) {
             view_id = created_view->GetRoutingID();
           }
 
-          window->GetBaseWindow()->Show();
+          window->Show(ShellWindow::SHOW_ACTIVE);
           base::DictionaryValue* result = new base::DictionaryValue;
           result->Set("viewId", new base::FundamentalValue(view_id));
           SetCreateResultFromShellWindow(window, result);
           result->SetBoolean("existingWindow", true);
           result->SetBoolean("injectTitlebar", false);
           SetResult(result);
           SendResponse(true);
           return true;
         }
       }
@@ skipping 127 matching lines @@
           ->HadDevToolsAttached(created_view)) {
     new DevToolsRestorer(this, created_view);
     return true;
   }
 
   SendResponse(true);
   return true;
 }
 
 }  // namespace extensions