Allow to create ARC++ windows minimized on startup.

components/exo/shell_surface.cc

 // Copyright 2015 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 "components/exo/shell_surface.h"
 
 #include <algorithm>
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 429 matching lines @@
   // Note: This will ask client to configure its surface even if already
   // maximized.
   ScopedConfigure scoped_configure(this, true);
   widget_->Maximize();
 }
 
 void ShellSurface::Minimize() {
   TRACE_EVENT0("exo", "ShellSurface::Minimize");
 
   if (!widget_)
-    return;
+    CreateShellSurfaceWidget(ui::SHOW_STATE_MINIMIZED);
 
   // Note: This will ask client to configure its surface even if already
   // minimized.
   ScopedConfigure scoped_configure(this, true);
   widget_->Minimize();
 }
 
 void ShellSurface::Restore() {
   TRACE_EVENT0("exo", "ShellSurface::Restore");
 
@@ skipping 941 matching lines @@
       shadow_overlay_->layer()->Add(shadow->layer());
       window->AddChild(shadow_overlay_);
       shadow_overlay_->Show();
     }
     shadow_overlay_->SetBounds(shadow_bounds);
     shadow->SetContentBounds(gfx::Rect(shadow_bounds.size()));
   }
 }
 
 }  // namespace exo