Added hover feedback on touch to launcher buttons.

ash/launcher/launcher_button.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_button.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/launcher/launcher_button_host.h"
 #include "grit/ui_resources.h"
+#include "skia/ext/image_operations.h"
+#include "ui/aura/event.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/throb_animation.h"
+#include "ui/base/events.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_element.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/layer_animation_sequence.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia_operations.h"
 #include "ui/gfx/transform_util.h"
@@ skipping 334 matching lines @@
 
 void LauncherButton::OnMouseExited(const views::MouseEvent& event) {
   ClearState(STATE_HOVERED);
   CustomButton::OnMouseExited(event);
   host_->MouseExitedButton(this);
 }
 
 ui::GestureStatus LauncherButton::OnGestureEvent(
     const views::GestureEvent& event) {
   switch (event.type()) {
+    case ui::ET_GESTURE_TAP_DOWN:
+      AddState(STATE_HOVERED);
+      return CustomButton::OnGestureEvent(event);
+    case ui::ET_GESTURE_END:
+      ClearState(STATE_HOVERED);
+      return CustomButton::OnGestureEvent(event);
     case ui::ET_GESTURE_SCROLL_BEGIN:
       host_->PointerPressedOnButton(this, LauncherButtonHost::TOUCH, event);
       return ui::GESTURE_STATUS_CONSUMED;
     case ui::ET_GESTURE_SCROLL_UPDATE:
       host_->PointerDraggedOnButton(this, LauncherButtonHost::TOUCH, event);
       return ui::GESTURE_STATUS_CONSUMED;
     case ui::ET_GESTURE_SCROLL_END:
       host_->PointerReleasedOnButton(this, LauncherButtonHost::TOUCH, false);
       return ui::GESTURE_STATUS_CONSUMED;
     default:
@@ skipping 115 matching lines @@
       bar_->SetVerticalAlignment(views::ImageView::CENTER);
       break;
   }
 
   Layout();
   SchedulePaint();
 }
 
 }  // namespace internal
 }  // namespace ash