Finish implementation of automation API hit testing for the desktop.

chrome/browser/ui/aura/accessibility/automation_manager_aura.cc

Index: chrome/browser/ui/aura/accessibility/automation_manager_aura.cc
diff --git a/chrome/browser/ui/aura/accessibility/automation_manager_aura.cc b/chrome/browser/ui/aura/accessibility/automation_manager_aura.cc
index 462a087b66268f1f3da7eb392122f69c8f60ca99..1818c1134b1f38e6d871a218b1124b3964c64e23 100644
--- a/chrome/browser/ui/aura/accessibility/automation_manager_aura.cc
+++ b/chrome/browser/ui/aura/accessibility/automation_manager_aura.cc
@@ -15,9 +15,11 @@
 #include "chrome/common/extensions/chrome_extension_messages.h"
 #include "content/public/browser/ax_event_notification_details.h"
 #include "content/public/browser/browser_context.h"
+#include "content/public/browser/render_frame_host.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_tree_id_registry.h"
+#include "ui/accessibility/platform/aura_window_properties.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/views/accessibility/ax_aura_obj_wrapper.h"
@@ -25,6 +27,7 @@
 #include "ui/views/widget/widget.h"
 
 #if defined(OS_CHROMEOS)
+#include "ash/shell.h"           // nogncheck
 #include "ash/wm/window_util.h"  // nogncheck
 #endif
 
@@ -81,10 +84,16 @@ void AutomationManagerAura::HandleAlert(content::BrowserContext* context,
   SendEvent(context, obj, ui::AX_EVENT_ALERT);
 }
 
-void AutomationManagerAura::PerformAction(
-    const ui::AXActionData& data) {
+void AutomationManagerAura::PerformAction(const ui::AXActionData& data) {
   CHECK(enabled_);
 
+  // Unlike all of the other actions, a hit test requires determining the
+  // node to perform the action on first.
+  if (data.action == ui::AX_ACTION_HIT_TEST) {
+    PerformHitTest(data);
+    return;
+  }
+
   current_tree_->HandleAccessibleAction(data);
 }
 
@@ -161,3 +170,60 @@ void AutomationManagerAura::SendEvent(BrowserContext* context,
               pending_events_copy[i].second);
   }
 }
+
+void AutomationManagerAura::PerformHitTest(
+    const ui::AXActionData& original_action) {
+#if defined(OS_CHROMEOS)
+  ui::AXActionData action = original_action;
+  aura::Window* root_window = ash::Shell::Get()->GetPrimaryRootWindow();
+  if (!root_window)
+    return;
+
+  // Determine which aura Window is associated with the target point.
+  aura::Window* window =
+      root_window->GetEventHandlerForPoint(action.target_point);
+  if (!window)
+    return;
+
+  // Convert point to local coordinates of the hit window.
+  aura::Window::ConvertPointToTarget(root_window, window, &action.target_point);
+
+  // If the window has a child AX tree ID, forward the action to the
+  // associated AXHostDelegate or RenderFrameHost.
+  ui::AXTreeIDRegistry::AXTreeID child_ax_tree_id =
+      window->GetProperty(ui::kChildAXTreeID);
+  if (child_ax_tree_id != ui::AXTreeIDRegistry::kNoAXTreeID) {
+    ui::AXTreeIDRegistry* registry = ui::AXTreeIDRegistry::GetInstance();
+    ui::AXHostDelegate* delegate = registry->GetHostDelegate(child_ax_tree_id);
+    if (delegate) {
+      delegate->PerformAction(action);
+      return;
+    }
+
+    content::RenderFrameHost* rfh =
+        content::RenderFrameHost::FromAXTreeID(child_ax_tree_id);
+    if (rfh)
+      rfh->AccessibilityPerformAction(action);
+    return;
+  }
+
+  // If the window doesn't have a child tree ID, try to fire the event
+  // on a View.
+  views::Widget* widget = views::Widget::GetWidgetForNativeView(window);
+  if (widget) {
+    views::View* root_view = widget->GetRootView();
+    views::View* hit_view =
+        root_view->GetEventHandlerForPoint(action.target_point);
+    if (hit_view) {
+      hit_view->NotifyAccessibilityEvent(action.hit_test_event_to_fire, true);
+      return;
+    }
+  }
+
+  // Otherwise, fire the event directly on the Window.
+  views::AXAuraObjWrapper* window_wrapper =
+      views::AXAuraObjCache::GetInstance()->GetOrCreate(window);
+  if (window_wrapper)
+    SendEvent(nullptr, window_wrapper, action.hit_test_event_to_fire);
+#endif
+}