Fixed IAccessible::accNavigate for NAVDIR_NEXT and NAVDIR_PREVIOUS when start object was a simple c…

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 31 matching lines @@
                               bool root_changed,
                               const std::vector<Change>& changes) override {}
 };
 
 TestAXTreeDelegate g_ax_tree_delegate;
 
 }  // namespace
 
 // static
 TestAXNodeWrapper* TestAXNodeWrapper::GetOrCreate(AXTree* tree, AXNode* node) {
-  // Just return NULL if |node| is NULL; this makes test code simpler because
-  // now we don't have to null-check AXNode* every time we call GetOrCreate.
-  if (!node)
+  if (!tree || !node)
     return nullptr;
 
   tree->SetDelegate(&g_ax_tree_delegate);
   auto iter = g_node_to_wrapper_map.find(node);
   if (iter != g_node_to_wrapper_map.end())
     return iter->second;
   TestAXNodeWrapper* wrapper = new TestAXNodeWrapper(tree, node);
   g_node_to_wrapper_map[node] = wrapper;
   return wrapper;
 }
@@ skipping 60 matching lines @@
   return true;
 }
 
 TestAXNodeWrapper::TestAXNodeWrapper(AXTree* tree, AXNode* node)
     : tree_(tree),
       node_(node),
       platform_node_(AXPlatformNode::Create(this)) {
 }
 
 }  // namespace ui