Use active state on touch start for tray icons

ash/system/overview/overview_button_tray.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 "ash/system/overview/overview_button_tray.h"
 
 #include "ash/shelf/shelf_types.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/tray_utils.h"
@@ skipping 22 matching lines @@
 OverviewButtonTray::OverviewButtonTray(StatusAreaWidget* status_area_widget)
     : TrayBackgroundView(status_area_widget), icon_(NULL) {
   SetContentsBackground();
 
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   icon_ = new views::ImageView();
   icon_->SetImage(
       bundle.GetImageNamed(IDR_AURA_UBER_TRAY_OVERVIEW_MODE).ToImageSkia());
   SetIconBorderForShelfAlignment();
   tray_container()->AddChildView(icon_);
-
-  Shell::GetInstance()->AddShellObserver(this);
 }
 
 OverviewButtonTray::~OverviewButtonTray() {
-  Shell::GetInstance()->RemoveShellObserver(this);
 }
 
 void OverviewButtonTray::UpdateAfterLoginStatusChange(
     user::LoginStatus status) {
   UpdateIconVisibility();
 }
 
 bool OverviewButtonTray::PerformAction(const ui::Event& event) {
-  Shell::GetInstance()->window_selector_controller()->ToggleOverview();
+  WindowSelectorController* controller =
+      Shell::GetInstance()->window_selector_controller();
+  controller->ToggleOverview();
+  SetDrawBackgroundAsActive(controller->IsSelecting());
   return true;
 }
 
 void OverviewButtonTray::OnMaximizeModeStarted() {
   UpdateIconVisibility();
+  TrayBackgroundView::OnMaximizeModeStarted();
 }
 
 void OverviewButtonTray::OnMaximizeModeEnded() {
   UpdateIconVisibility();
+  TrayBackgroundView::OnMaximizeModeEnded();
 }
 
 bool OverviewButtonTray::ClickedOutsideBubble() {
   // This class has no bubbles dismiss, but acknowledge that the message was
   // handled.
   return true;
 }
 
 base::string16 OverviewButtonTray::GetAccessibleNameForTray() {
   return l10n_util::GetStringUTF16(IDS_ASH_OVERVIEW_BUTTON_ACCESSIBLE_NAME);
@@ skipping 29 matching lines @@
   }
 }
 
 void OverviewButtonTray::UpdateIconVisibility() {
   SetVisible(Shell::GetInstance()->maximize_mode_controller()->
                  IsMaximizeModeWindowManagerEnabled() &&
              Shell::GetInstance()->window_selector_controller()->CanSelect());
 }
 
 }  // namespace ash