ash: Update launcher background to 0.8 black.

ash/launcher/launcher.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/launcher/launcher.h"
 
 #include <algorithm>
 
 #include "ash/focus_cycler.h"
 #include "ash/launcher/launcher_delegate.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/launcher/launcher_navigator.h"
 #include "ash/launcher/launcher_view.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/shelf_layout_manager.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image.h"
 #include "ui/views/accessible_pane_view.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace ash {
 
-namespace {
-
-// Max alpha of the background.
-const int kBackgroundAlpha = 128;
-
-}
-
 // The contents view of the Widget. This view contains LauncherView and
 // sizes it to the width of the widget minus the size of the status area.
 class Launcher::DelegateView : public views::WidgetDelegate,
                                public views::AccessiblePaneView {
  public:
   explicit DelegateView(Launcher* launcher);
   virtual ~DelegateView();
 
   void set_focus_cycler(internal::FocusCycler* focus_cycler) {
     focus_cycler_ = focus_cycler;
@@ skipping 53 matching lines @@
 // Launcher --------------------------------------------------------------------
 
 Launcher::Launcher(aura::Window* window_container,
                    internal::ShelfLayoutManager* shelf_layout_manager)
     : widget_(NULL),
       window_container_(window_container),
       delegate_view_(NULL),
       launcher_view_(NULL),
       alignment_(SHELF_ALIGNMENT_BOTTOM),
       ALLOW_THIS_IN_INITIALIZER_LIST(
-          background_animator_(this, 0, kBackgroundAlpha)) {
+          background_animator_(this, 0, kLauncherBackgroundAlpha)) {
   model_.reset(new LauncherModel);
   if (Shell::GetInstance()->delegate()) {
     delegate_.reset(
         Shell::GetInstance()->delegate()->CreateLauncherDelegate(model_.get()));
   }
 
   widget_.reset(new views::Widget);
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   // The launcher only ever draws a solid color.
@@ skipping 108 matching lines @@
 internal::LauncherView* Launcher::GetLauncherViewForTest() {
   return launcher_view_;
 }
 
 void Launcher::UpdateBackground(int alpha) {
   ui::Layer* layer = widget_->GetNativeView()->layer();
   layer->SetColor(SkColorSetARGB(alpha, 0, 0, 0));
 }
 
 }  // namespace ash