Implement accessibility support for CSS-transformed iframes.

ui/accessibility/ax_node_data.h

 // Copyright 2013 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.
 
 #ifndef UI_ACCESSIBILITY_AX_NODE_DATA_H_
 #define UI_ACCESSIBILITY_AX_NODE_DATA_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
 #include "base/strings/string_split.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_export.h"
 #include "ui/gfx/geometry/rect.h"
 
+namespace gfx {
+class Transform;
+};
+
 namespace ui {
 
 // A compact representation of the accessibility information for a
 // single accessible object, in a form that can be serialized and sent from
 // one process to another.
 struct AX_EXPORT AXNodeData {
   AXNodeData();
   virtual ~AXNodeData();
 
   AXNodeData(const AXNodeData& other);
@@ skipping 65 matching lines @@
   virtual std::string ToString() const;
 
   bool IsRoot() const;
   void SetRoot();
 
   // As much as possible this should behave as a simple, serializable,
   // copyable struct.
   int32_t id;
   AXRole role;
   uint32_t state;
-  gfx::Rect location;
   std::vector<std::pair<AXStringAttribute, std::string> > string_attributes;
   std::vector<std::pair<AXIntAttribute, int32_t>> int_attributes;
   std::vector<std::pair<AXFloatAttribute, float> > float_attributes;
   std::vector<std::pair<AXBoolAttribute, bool> > bool_attributes;
   std::vector<std::pair<AXIntListAttribute, std::vector<int32_t>>>
       intlist_attributes;
   base::StringPairs html_attributes;
   std::vector<int32_t> child_ids;
+
+  // The object's location relative to its window or frame.
+  gfx::Rect location;
+
+  // An additional transform to apply to position this object and its subtree.
+  // NOTE: this member is a scoped_ptr because it's rare and gfx::Transform
+  // takes up a fair amount of space. The assignment operator and copy
+  // constructor both make a duplicate of the owned pointer, so it acts more
+  // like a member than a pointer.
+  scoped_ptr<gfx::Transform> transform;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_AX_NODE_DATA_H_