Add support for transparent background API

chrome/browser/ui/views/apps/chrome_native_app_window_views_win.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 "chrome/browser/ui/views/apps/chrome_native_app_window_views_win.h"
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "apps/ui/views/app_window_frame_view.h"
 #include "ash/shell.h"
@@ skipping 107 matching lines @@
   HWND hwnd = GetNativeAppWindowHWND();
   Profile* profile =
       Profile::FromBrowserContext(app_window()->browser_context());
   app_model_id_ =
       ShellIntegration::GetAppModelIdForProfile(app_name_wide,
                                                 profile->GetPath());
   ui::win::SetAppIdForWindow(app_model_id_, hwnd);
 
   web_app::UpdateRelaunchDetailsForApp(profile, extension, hwnd);
 
-  if (!create_params.transparent_background && !IsRunningInAsh())
+  if (!create_params.alpha_enabled && !IsRunningInAsh())
     EnsureCaptionStyleSet();
   UpdateShelfMenu();
 }
 
 views::NonClientFrameView*
 ChromeNativeAppWindowViewsWin::CreateStandardDesktopAppFrame() {
   glass_frame_view_ = NULL;
   if (ui::win::IsAeroGlassEnabled()) {
     glass_frame_view_ = new GlassAppWindowFrameViewWin(this, widget());
     return glass_frame_view_;
@@ skipping 48 matching lines @@
                                               extension->id());
 
     ShellLinkItemList items;
     items.push_back(link);
     jumplist_updater.AddTasks(items);
   }
 
   // Note that an empty jumplist must still be committed to clear all items.
   jumplist_updater.CommitUpdate();
 }