Implement caching asynchronous accessibility hit testing.

content/browser/accessibility/browser_accessibility_auralinux.cc

 // Copyright (c) 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 "content/browser/accessibility/browser_accessibility_auralinux.h"
 
 #include <stdint.h>
 #include <string.h>
 
 #include "base/strings/utf_string_conversions.h"
@@ skipping 126 matching lines @@
     gint y,
     AtkCoordType coord_type) {
   g_return_val_if_fail(ATK_IS_COMPONENT(atk_component), 0);
 
   BrowserAccessibilityAuraLinux* obj =
       ToBrowserAccessibilityAuraLinux(atk_component);
   if (!obj)
     return NULL;
 
   gfx::Point point(x, y);
-  if (!obj->GetScreenBoundsRect().Contains(point))
-    return NULL;
-
-  BrowserAccessibility* result = obj->BrowserAccessibilityForPoint(point);
+  BrowserAccessibility* result = obj->manager()->CachingAsyncHitTest(point);
   if (!result)
     return NULL;
 
   AtkObject* atk_result =
       ToBrowserAccessibilityAuraLinux(result)->GetAtkObject();
   g_object_ref(atk_result);
   return atk_result;
 }
 
 static void browser_accessibility_get_extents(AtkComponent* atk_component,
@@ skipping 795 matching lines @@
       atk_role_ = ATK_ROLE_SECTION;
 #endif
       break;
     default:
       atk_role_ = ATK_ROLE_UNKNOWN;
       break;
   }
 }
 
 }  // namespace content