[PPAPI] It is now possible to pass filesystems from JavaScript to NaCl modules.

ppapi/proxy/raw_var_data.cc

 // Copyright (c) 2013 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.
 
 #include "ppapi/proxy/raw_var_data.h"
 
 #include <stack>
 
 #include "base/containers/hash_tables.h"
 #include "base/stl_util.h"
@@ skipping 677 matching lines @@
     creation_message_.reset(new IPC::Message(*message));
   else
     creation_message_.reset();
   pending_renderer_host_id_ = resource_var->GetPendingRendererHostId();
   pending_browser_host_id_ = resource_var->GetPendingBrowserHostId();
   initialized_ = true;
   return true;
 }
 
 PP_Var ResourceRawVarData::CreatePPVar(PP_Instance instance) {
-  // If pp_resource_ is NULL, it could be because we are on the plugin side and
-  // there is a pending resource host on the renderer.
-  // TODO(mgiuca): Create a plugin-side resource in this case.
-  // Currently, this should never occur. This will be needed when passing a
-  // resource from the renderer to the plugin (http://crbug.com/177017).
-  DCHECK(pp_resource_);
+  // If this is not a pending resource host, just create the var.
+  if (pp_resource_ || !creation_message_) {
+    return PpapiGlobals::Get()->GetVarTracker()->MakeResourcePPVar(
+        pp_resource_);
+  }
 
-  return PpapiGlobals::Get()->GetVarTracker()->MakeResourcePPVar(pp_resource_);
+  // This is a pending resource host, so create the resource and var.
+  return PpapiGlobals::Get()->GetVarTracker()->MakeResourcePPVarFromMessage(
+      instance,
+      *creation_message_,
+      pending_renderer_host_id_,
+      pending_browser_host_id_);
 }
 
 void ResourceRawVarData::PopulatePPVar(const PP_Var& var,
                                        const std::vector<PP_Var>& graph) {
 }
 
 void ResourceRawVarData::Write(IPC::Message* m,
                                const HandleWriter& handle_writer) {
   m->WriteInt(static_cast<int>(pp_resource_));
   m->WriteInt(pending_renderer_host_id_);
@@ skipping 22 matching lines @@
     if (!IPC::ParamTraits<IPC::Message>::Read(m, iter, creation_message_.get()))
       return false;
   } else {
     creation_message_.reset();
   }
   return true;
 }
 
 }  // namespace proxy
 }  // namespace ppapi