3D Compositing in <browser>, first draft.

ipc/ipc_forwarding_message_filter.cc

Index: ipc/ipc_forwarding_message_filter.cc
diff --git a/ipc/ipc_forwarding_message_filter.cc b/ipc/ipc_forwarding_message_filter.cc
index d886706cc423846b487714b418d1ee5cf1277be3..5acffc3240d54818a64ea53379eb2fb8bc0ad86d 100644
--- a/ipc/ipc_forwarding_message_filter.cc
+++ b/ipc/ipc_forwarding_message_filter.cc
@@ -13,7 +13,8 @@ ForwardingMessageFilter::ForwardingMessageFilter(
     const uint32* message_ids_to_filter,
     size_t num_message_ids_to_filter,
     base::TaskRunner* target_task_runner)
-    : target_task_runner_(target_task_runner) {
+    : target_task_runner_(target_task_runner)
+    , id_callback_(base::Bind(&GetMessageRoutingID)) {
   DCHECK(target_task_runner_);
   for (size_t i = 0; i < num_message_ids_to_filter; i++)
     message_ids_to_filter_.insert(message_ids_to_filter[i]);
@@ -30,19 +31,26 @@ void ForwardingMessageFilter::RemoveRoute(int routing_id) {
   handlers_.erase(routing_id);
 }
 
+void ForwardingMessageFilter::SetIDCallback(const IDCallback& id_callback) {
+  base::AutoLock locked(handlers_lock_);
+  DCHECK(!id_callback.is_null());
+  id_callback_ = id_callback;
+}
+
 bool ForwardingMessageFilter::OnMessageReceived(const Message& message) {
   if (message_ids_to_filter_.find(message.type()) ==
       message_ids_to_filter_.end())
     return false;
 
-
   Handler handler;
 
   {
     base::AutoLock locked(handlers_lock_);
-    std::map<int, Handler>::iterator it = handlers_.find(message.routing_id());
+    std::map<int, Handler>::iterator it =
+        handlers_.find(id_callback_.Run(message));
     if (it == handlers_.end())
       return false;
+
     handler = it->second;
   }