Change the launcher to use AccessiblePaneView, and make the buttons focusable

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 "ash/launcher/launcher_model.h"
 #include "ash/launcher/launcher_view.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "grit/ui_resources.h"
 #include "ui/aura/window.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/compositor/layer.h"
 #include "ui/gfx/image/image.h"
+#include "ui/views/accessible_pane_view.h"
 #include "ui/views/painter.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
 namespace {
 
 // Used to draw the background of the shelf.
 class ShelfPainter : public views::Painter {
  public:
   ShelfPainter() {
     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
     image_ = *rb.GetImageNamed(IDR_AURA_LAUNCHER_BACKGROUND).ToSkBitmap();
   }
 
   virtual void Paint(int w, int h, gfx::Canvas* canvas) OVERRIDE {
     canvas->TileImageInt(image_, 0, 0, w, h);
   }
 
  private:
   SkBitmap image_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfPainter);
 };
 
 }  // namespace
 
 // 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::WidgetDelegateView {
+class Launcher::DelegateView : public views::WidgetDelegate,
+                               public views::AccessiblePaneView {
  public:
   explicit DelegateView();
   virtual ~DelegateView();
 
   void SetStatusWidth(int width);
   int status_width() const { return status_width_; }
 
   // views::View overrides
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void Layout() OVERRIDE;
 
+  virtual views::Widget* GetWidget() OVERRIDE {
+    return View::GetWidget();
+  }
+
+  virtual const views::Widget* GetWidget() const OVERRIDE {
+    return View::GetWidget();
+  }
+
+
  private:
   int status_width_;
 
   DISALLOW_COPY_AND_ASSIGN(DelegateView);
 };
 
 Launcher::DelegateView::DelegateView()
     : status_width_(0) {
   set_background(
       views::Background::CreateBackgroundPainter(true, new ShelfPainter()));
@@ skipping 55 matching lines @@
 
 void Launcher::SetStatusWidth(int width) {
   delegate_view_->SetStatusWidth(width);
 }
 
 int Launcher::GetStatusWidth() {
   return delegate_view_->status_width();
 }
 
 }  // namespace ash