Add ability to create pending resource hosts.

ppapi/proxy/plugin_resource.cc

Index: ppapi/proxy/plugin_resource.cc
diff --git a/ppapi/proxy/plugin_resource.cc b/ppapi/proxy/plugin_resource.cc
index 3a023091496f0e4da669d32e6d8c9e12ea002087..fca06308cdd548a7fd7d5718f3ebe7e1a7bed7e2 100644
--- a/ppapi/proxy/plugin_resource.cc
+++ b/ppapi/proxy/plugin_resource.cc
@@ -81,6 +81,20 @@ void PluginResource::SendCreate(Destination dest, const IPC::Message& msg) {
       new PpapiHostMsg_ResourceCreated(params, pp_instance(), msg));
 }
 
+void PluginResource::AttachToPendingHost(Destination dest,
+                                         int pending_host_id) {
+  // Connecting to a pending host is a replacement for "create".
+  if (dest == RENDERER) {
+    DCHECK(!sent_create_to_renderer_);
+    sent_create_to_renderer_ = true;
+  } else {
+    DCHECK(!sent_create_to_browser_);
+    sent_create_to_browser_ = true;
+  }
+  GetSender(dest)->Send(
+      new PpapiHostMsg_AttachToPendingHost(pp_resource(), pending_host_id));
+}
+
 void PluginResource::Post(Destination dest, const IPC::Message& msg) {
   ResourceMessageCallParams params(pp_resource(), GetNextSequence());
   SendResourceCall(dest, params, msg);