Implement accessibility support for CSS-transformed iframes.

content/common/accessibility_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for accessibility.
 // Multiply-included message file, hence no include guard.
 
 #include "content/common/ax_content_node_data.h"
 #include "content/common/content_export.h"
 #include "content/common/view_message_enums.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_param_traits.h"
 #include "ipc/param_traits_macros.h"
 #include "third_party/WebKit/public/web/WebAXEnums.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/ax_tree_update.h"
+#include "ui/gfx/transform.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
 #define IPC_MESSAGE_START AccessibilityMsgStart
 
 IPC_ENUM_TRAITS_MAX_VALUE(content::AXContentIntAttribute,
                           content::AX_CONTENT_INT_ATTRIBUTE_LAST)
 
 IPC_STRUCT_TRAITS_BEGIN(content::AXContentNodeData)
   IPC_STRUCT_TRAITS_MEMBER(id)
   IPC_STRUCT_TRAITS_MEMBER(role)
   IPC_STRUCT_TRAITS_MEMBER(state)
   IPC_STRUCT_TRAITS_MEMBER(location)
+  IPC_STRUCT_TRAITS_MEMBER(transform)
   IPC_STRUCT_TRAITS_MEMBER(string_attributes)
   IPC_STRUCT_TRAITS_MEMBER(int_attributes)
   IPC_STRUCT_TRAITS_MEMBER(float_attributes)
   IPC_STRUCT_TRAITS_MEMBER(bool_attributes)
   IPC_STRUCT_TRAITS_MEMBER(intlist_attributes)
   IPC_STRUCT_TRAITS_MEMBER(html_attributes)
   IPC_STRUCT_TRAITS_MEMBER(child_ids)
   IPC_STRUCT_TRAITS_MEMBER(content_int_attributes)
 IPC_STRUCT_TRAITS_END()
 
@@ skipping 173 matching lines @@
 IPC_MESSAGE_ROUTED1(
     AccessibilityHostMsg_FindInPageResult,
     AccessibilityHostMsg_FindInPageResultParams)
 
 // Sent in response to AccessibilityMsg_SnapshotTree. The callback id that was
 // passed to the request will be returned in |callback_id|, along with
 // a standalone snapshot of the accessibility tree.
 IPC_MESSAGE_ROUTED2(AccessibilityHostMsg_SnapshotResponse,
                     int /* callback_id */,
                     content::AXContentTreeUpdate)