Refactor content/renderer/accessibility to use AXTreeSerializer (re-land).

content/common/accessibility_messages.h

Index: content/common/accessibility_messages.h
diff --git a/content/common/accessibility_messages.h b/content/common/accessibility_messages.h
index 8f48edeb4da1fcd50c8e3db4e95e0c1907f1237e..5deae86a1c38ce90b6aeef8f50fc671b689d8e22 100644
--- a/content/common/accessibility_messages.h
+++ b/content/common/accessibility_messages.h
@@ -15,6 +15,7 @@
 #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"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
@@ -44,10 +45,14 @@ IPC_STRUCT_TRAITS_BEGIN(ui::AXNodeData)
   IPC_STRUCT_TRAITS_MEMBER(child_ids)
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(ui::AXTreeUpdate)
+  IPC_STRUCT_TRAITS_MEMBER(node_id_to_clear)

[aboxhall, 2014/02/25 17:45:35]

Can we have comments for these too?

[dmazzoni, 2014/02/27 20:51:44]

This isn't the struct, this is just the macro that allows the struct to be
passed via IPC

[aboxhall, 2014/02/27 20:57:39]

Ah, I see.

+  IPC_STRUCT_TRAITS_MEMBER(nodes)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_BEGIN(AccessibilityHostMsg_EventParams)
-  // Vector of nodes in the tree that need to be updated before
-  // sending the event.
-  IPC_STRUCT_MEMBER(std::vector<ui::AXNodeData>, nodes)
+  // The tree update.
+  IPC_STRUCT_MEMBER(ui::AXTreeUpdate, update)
 
   // Type of event.
   IPC_STRUCT_MEMBER(ui::AXEvent, event_type)