Forward BrowserAccessibility::accHitTest to AXPlatformNode.

ui/accessibility/platform/test_ax_node_wrapper.cc

 // Copyright 2015 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 "base/containers/hash_tables.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/platform/test_ax_node_wrapper.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 
 namespace ui {
@@ skipping 93 matching lines @@
       child_wrapper->ax_platform_node()->GetNativeViewAccessible() :
       nullptr;
 }
 
 gfx::Rect TestAXNodeWrapper::GetScreenBoundsRect() const {
   gfx::RectF bounds = GetData().location;
   bounds.Offset(g_offset);
   return gfx::ToEnclosingRect(bounds);
 }
 
+TestAXNodeWrapper* TestAXNodeWrapper::HitTestSyncInternal(int x, int y) {
+  // Here we find the deepest child whose bounding box contains the given point.
+  // The assuptions are that there are no overlapping bounding rects and that
+  // all children have smaller bounding rects than their parents.
+  if (!GetScreenBoundsRect().Contains(gfx::Rect(x, y)))
+    return nullptr;
+
+  for (int i = 0; i < GetChildCount(); i++) {
+    TestAXNodeWrapper* child = GetOrCreate(tree_, node_->children()[i]);
+    if (!child)
+      return nullptr;
+
+    TestAXNodeWrapper* result = child->HitTestSyncInternal(x, y);
+    if (result) {
+      return result;
+    }
+  }
+  return this;
+}
+
 gfx::NativeViewAccessible TestAXNodeWrapper::HitTestSync(int x, int y) {
-  return nullptr;
+  TestAXNodeWrapper* wrapper = HitTestSyncInternal(x, y);
+  return wrapper ? wrapper->ax_platform_node()->GetNativeViewAccessible()
+                 : nullptr;
 }
 
 gfx::NativeViewAccessible TestAXNodeWrapper::GetFocus() {
   return nullptr;
 }
 
 gfx::AcceleratedWidget
 TestAXNodeWrapper::GetTargetForNativeAccessibilityEvent() {
   return gfx::kNullAcceleratedWidget;
 }
 
 bool TestAXNodeWrapper::AccessibilityPerformAction(
     const ui::AXActionData& data) {
   return true;
 }
 
 TestAXNodeWrapper::TestAXNodeWrapper(AXTree* tree, AXNode* node)
     : tree_(tree),
       node_(node),
       platform_node_(AXPlatformNode::Create(this)) {
 }
 
 }  // namespace ui