Remove hack for handling accessibility action on ARC notifications.

ui/arc/notification/arc_custom_notification_view.cc

 // Copyright 2016 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 "ui/arc/notification/arc_custom_notification_view.h"
 
 #include "ash/wm/window_util.h"
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
 #include "components/exo/notification_surface.h"
 #include "components/exo/surface.h"
+#include "ui/accessibility/ax_action_data.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/animation/linear_animation.h"
 #include "ui/gfx/animation/tween.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/transform.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/custom_notification_view.h"
@@ skipping 595 matching lines @@
   }
 }
 
 views::FocusTraversable* ArcCustomNotificationView::GetFocusTraversable() {
   if (floating_control_buttons_widget_)
     return static_cast<views::internal::RootView*>(
         floating_control_buttons_widget_->GetRootView());
   return nullptr;
 }
 
-bool ArcCustomNotificationView::OnMousePressed(const ui::MouseEvent& event) {
-  // TODO(yhanada): Remove this hack as soon as possible after letting
-  // accessible actions be delivered to this view.
-  // All mouse clicks or touches should be sent to corresponding Android view
-  // because the surface is on this view, so receiving a mouse pressed event
-  // means the event is generated by automation API.
-  // We can distinguish events from automation API by checking the target of the
-  // event because the target of all events generated by automation API is set
-  // to nullptr.
-  if (event.IsOnlyLeftMouseButton() && item_ &&
-      item_->expand_state() != mojom::ArcNotificationExpandState::FIXED_SIZE &&
-      event.target() == nullptr) {
+bool ArcCustomNotificationView::HandleAccessibleAction(
+    const ui::AXActionData& action_data) {
+  if (item_ && action_data.action == ui::AX_ACTION_DO_DEFAULT) {
     item_->ToggleExpansion();
     return true;
   }
   return false;
 }
 
 void ArcCustomNotificationView::ButtonPressed(views::Button* sender,
                                               const ui::Event& event) {
   if (item_ && !item_->pinned() && sender == close_button_.get()) {
     CHECK_EQ(message_center::CustomNotificationView::kViewClassName,
@@ skipping 79 matching lines @@
     }
     if (close_button_) {
       close_button_->set_background(
           views::Background::CreateSolidBackground(current_color));
       close_button_->SchedulePaint();
     }
   }
 }
 
 }  // namespace arc