Added arrow key navigation to Overview Mode

ash/wm/overview/window_selector_item.cc

 // Copyright 2013 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/wm/overview/window_selector_item.h"
 
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/overview/scoped_transform_overview_window.h"
@@ skipping 102 matching lines @@
 void WindowSelectorItem::RecomputeWindowTransforms() {
   if (in_bounds_update_ || target_bounds_.IsEmpty())
     return;
   DCHECK(root_window_);
   base::AutoReset<bool> auto_reset_in_bounds_update(&in_bounds_update_, true);
   gfx::Rect inset_bounds(target_bounds_);
   inset_bounds.Inset(kWindowMargin, kWindowMargin);
   SetItemBounds(root_window_, inset_bounds, false);
 }
 
+void WindowSelectorItem::SendFocusAlert() const {
+  activate_window_button_->SendFocusAlert();
+}
+
 void WindowSelectorItem::UpdateWindowLabels(const gfx::Rect& window_bounds,
                                             aura::Window* root_window,
                                             bool animate) {
   gfx::Rect converted_bounds = ScreenUtil::ConvertRectFromScreen(root_window,
                                                                  window_bounds);
   gfx::Rect label_bounds(converted_bounds.x(),
                          converted_bounds.bottom(),
                          converted_bounds.width(),
                          0);
 
@@ skipping 41 matching lines @@
       settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
           ScopedTransformOverviewWindow::kTransitionMilliseconds));
       window_label_->GetNativeWindow()->SetBounds(label_bounds);
     } else {
       window_label_->GetNativeWindow()->SetBounds(label_bounds);
     }
   }
 }
 
 }  // namespace ash