ash: Make the buttons in the tray-popup headers accessible from keyboard.

ash/system/tray/tray_views.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/system/tray/tray_views.h"
 
 #include "ash/system/tray/tray_constants.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "grit/ash_strings.h"
 #include "grit/ui_resources.h"
@@ skipping 274 matching lines @@
     : views::ToggleImageButton(listener) {
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   SetImage(views::CustomButton::BS_NORMAL,
       bundle.GetImageNamed(enabled_resource_id).ToSkBitmap());
   SetToggledImage(views::CustomButton::BS_NORMAL,
       bundle.GetImageNamed(disabled_resource_id).ToSkBitmap());
   SetImageAlignment(views::ImageButton::ALIGN_CENTER,
                     views::ImageButton::ALIGN_MIDDLE);
   set_background(views::Background::CreateSolidBackground(
       ash::kHeaderBackgroundColor));
+  set_focusable(true);
 }
 
 TrayPopupHeaderButton::~TrayPopupHeaderButton() {}
 
 gfx::Size TrayPopupHeaderButton::GetPreferredSize() {
   return gfx::Size(ash::kTrayPopupItemHeight, ash::kTrayPopupItemHeight);
 }
 
 void TrayPopupHeaderButton::OnPaintBorder(gfx::Canvas* canvas) {
   // Left border.
   canvas->FillRect(gfx::Rect(0, 0, 1, height()), ash::kBorderDarkColor);
 }
 
+void TrayPopupHeaderButton::OnPaintFocusBorder(gfx::Canvas* canvas) {
+  if (HasFocus() && (focusable() || IsAccessibilityFocusable())) {
+    canvas->DrawRect(gfx::Rect(2, 1, width() - 4, height() - 3),
+                     kFocusBorderColor);
+  }
+}
+
 void TrayPopupHeaderButton::StateChanged() {
   set_background(views::Background::CreateSolidBackground(
       IsHotTracked() ? ash::kHeaderHoverBackgroundColor :
                        ash::kHeaderBackgroundColor));
 }
 
 views::View* CreateDetailedHeaderEntry(int string_id,
                                        ViewClickListener* listener) {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   HoverHighlightView* container = new HoverHighlightView(listener);
@@ skipping 22 matching lines @@
   label->SetAutoColorReadabilityEnabled(false);
   label->SetEnabledColor(SK_ColorWHITE);
   label->SetBackgroundColor(SkColorSetARGB(0, 255, 255, 255));
   label->SetShadowColors(SkColorSetARGB(64, 0, 0, 0),
                          SkColorSetARGB(64, 0, 0, 0));
   label->SetShadowOffset(0, 1);
 }
 
 }  // namespace internal
 }  // namespace ash