Implement accessibility support for CSS-transformed iframes.

chrome/common/extensions/chrome_extension_messages.h

 // Copyright 2014 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.
 
 // Chrome-specific IPC messages for extensions.
 // Extension-related messages that aren't specific to Chrome live in
 // extensions/common/extension_messages.h.
 //
 // Multiply-included message file, hence no include guard.
 
@@ skipping 44 matching lines @@
                     int32_t /* install id */,
                     bool /* whether the install was successful */,
                     std::string /* error */,
                     extensions::webstore_install::Result /* result */)
 
 IPC_STRUCT_TRAITS_BEGIN(ui::AXNodeData)
   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_END()
 
 IPC_STRUCT_TRAITS_BEGIN(ui::AXTreeData)
@@ skipping 45 matching lines @@
 // Messages sent from the renderer to the browser.
 
 
 // Sent by the renderer to implement chrome.webstore.install().
 IPC_MESSAGE_ROUTED5(ExtensionHostMsg_InlineWebstoreInstall,
                     int32_t /* install id */,
                     int32_t /* return route id */,
                     std::string /* Web Store item ID */,
                     GURL /* requestor URL */,
                     int /* listeners_mask */)