Re-land: Finish implementation of automation API hit testing for the desktop

chrome/browser/chromeos/accessibility/select_to_speak_event_handler.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 "chrome/browser/chromeos/accessibility/select_to_speak_event_handler.h"
 
 #include "ash/shell.h"
 #include "base/logging.h"
 #include "chrome/browser/speech/tts_controller.h"
 #include "chrome/browser/ui/aura/accessibility/automation_manager_aura.h"
+#include "chrome/common/extensions/api/automation_api_constants.h"
 #include "content/public/browser/browser_thread.h"
+#include "ui/accessibility/ax_tree_id_registry.h"
 #include "ui/aura/window.h"
 #include "ui/display/display.h"
 #include "ui/events/event.h"
-#include "ui/views/focus/view_storage.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace chromeos {
 
 SelectToSpeakEventHandler::SelectToSpeakEventHandler() {
   if (ash::Shell::HasInstance())
     ash::Shell::Get()->GetPrimaryRootWindow()->AddPreTargetHandler(this);
 }
 
@@ skipping 88 matching lines @@
     case ui::ET_MOUSE_ENTERED:
     case ui::ET_MOUSE_EXITED:
       ax_event = ui::AX_EVENT_MOUSE_MOVED;
       break;
     default:
       return;
   }
 
   CancelEvent(event);
 
-  // Find the View to post the accessibility event on.
-  aura::Window* event_target = static_cast<aura::Window*>(event->target());
-  aura::Window* hit_window = event_target;
-  if (!hit_window)
-    return;
-
-  views::Widget* hit_widget = views::Widget::GetWidgetForNativeView(hit_window);
-  while (!hit_widget) {
-    hit_window = hit_window->parent();
-    if (!hit_window)
-      break;
-
-    hit_widget = views::Widget::GetWidgetForNativeView(hit_window);
-  }
-
-  if (!hit_window || !hit_widget)
-    return;
-
-  gfx::Point window_location = event->location();
-  aura::Window::ConvertPointToTarget(event_target, hit_window,
-                                     &window_location);
-
-  views::View* root_view = hit_widget->GetRootView();
-  views::View* hit_view = root_view->GetEventHandlerForPoint(window_location);
-
-  if (hit_view) {
-    // Send the accessibility event, then save the view so we can post the
-    // cancel event on the same view if possible.
-    hit_view->NotifyAccessibilityEvent(ax_event, true);
-    if (!last_view_storage_id_) {
-      last_view_storage_id_ =
-          views::ViewStorage::GetInstance()->CreateStorageID();
-    }
-    views::ViewStorage::GetInstance()->RemoveView(last_view_storage_id_);
-    views::ViewStorage::GetInstance()->StoreView(last_view_storage_id_,
-                                                 hit_view);
+  ui::AXTreeIDRegistry* registry = ui::AXTreeIDRegistry::GetInstance();
+  ui::AXHostDelegate* delegate =
+      registry->GetHostDelegate(extensions::api::automation::kDesktopTreeID);
+  if (delegate) {
+    ui::AXActionData action;
+    action.action = ui::AX_ACTION_HIT_TEST;
+    action.target_point = event->root_location();
+    action.hit_test_event_to_fire = ax_event;
+    delegate->PerformAction(action);
   }
 }
 
 void SelectToSpeakEventHandler::CancelEvent(ui::Event* event) {
   DCHECK(event);
   if (event->cancelable()) {
     event->SetHandled();
     event->StopPropagation();
   }
 }
 
 void SelectToSpeakEventHandler::SendCancelAXEvent() {
-  // If the user releases Search while the button is still down, cancel
-  // the Select-to-speak gesture. Try to post it on the same View that
-  // was last targeted, but if that's impossible, post it on the desktop.
-  views::View* last_view =
-      last_view_storage_id_
-          ? views::ViewStorage::GetInstance()->RetrieveView(
-                last_view_storage_id_)
-          : nullptr;
-  if (last_view) {
-    last_view->NotifyAccessibilityEvent(ui::AX_EVENT_MOUSE_CANCELED, true);
-  } else {
-    AutomationManagerAura::GetInstance()->HandleEvent(
-        nullptr, nullptr, ui::AX_EVENT_MOUSE_CANCELED);
-  }
+  AutomationManagerAura::GetInstance()->HandleEvent(
+      nullptr, nullptr, ui::AX_EVENT_MOUSE_CANCELED);
 }
 
 }  // namespace chromeos