[ABANDONED] Simplify ash shelf dimmer.

ash/common/system/tray/tray_background_view.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 "ash/common/system/tray/tray_background_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
@@ skipping 127 matching lines @@
         }};
 
     WmShelf* shelf = GetShelf();
     const int orientation = IsHorizontalAlignment(shelf->GetAlignment())
                                 ? kImageHorizontal
                                 : kImageVertical;
 
     int state = kImageTypeDefault;
     if (tray_background_view_->draw_background_as_active())
       state = kImageTypePressed;
-    else if (shelf->IsDimmed())
+    else if (shelf->GetBackgroundType() == SHELF_BACKGROUND_MAXIMIZED)
       state = kImageTypeOnBlack;
-    else
-      state = kImageTypeDefault;
 
     ui::CreateNineImagePainter(kImages[orientation][state])
         ->Paint(canvas, view->GetLocalBounds());
   }
 
   // Overridden from views::Background.
   void Paint(gfx::Canvas* canvas, views::View* view) const override {
     if (MaterialDesignController::IsShelfMaterial())
       PaintMaterial(canvas, view);
     else
@@ skipping 342 matching lines @@
     return;
   SchedulePaint();
 }
 
 void TrayBackgroundView::UpdateBubbleViewArrow(
     views::TrayBubbleView* bubble_view) {
   // Nothing to do here.
 }
 
 }  // namespace ash