diff -r 000000000000 -r 6474c204b198 dom/plugins/ipc/PBrowserStream.ipdl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/ipc/PBrowserStream.ipdl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PPluginInstance;
+
+
+using mozilla::plugins::Buffer from "mozilla/plugins/PluginMessageUtils.h";
+using mozilla::plugins::IPCByteRanges from "mozilla/plugins/PluginMessageUtils.h";
+
+using NPError from "npapi.h";
+using NPReason from "npapi.h";
+
+namespace mozilla {
+namespace plugins {
+
+/**
+ * NPBrowserStream represents a NPStream sent from the browser to the plugin.
+ */
+
+intr protocol PBrowserStream
+{
+  manager PPluginInstance;
+
+child:
+  async Write(int32_t offset, Buffer data,
+              uint32_t newlength);
+  async NPP_StreamAsFile(nsCString fname);
+
+  /**
+   * NPP_DestroyStream may race with other messages: the child acknowledges
+   * the message with StreamDestroyed before this actor is deleted.
+   */
+  async NPP_DestroyStream(NPReason reason);
+  async __delete__();
+
+parent:
+  intr NPN_RequestRead(IPCByteRanges ranges)
+    returns (NPError result);
+  async NPN_DestroyStream(NPReason reason);
+  async StreamDestroyed();
+
+/*
+  TODO: turn on state machine.
+
+  // need configurable start state: if the constructor
+  // returns an error in result, start state should
+  // be DELETING.
+start state ALIVE:
+  send Write goto ALIVE;
+  call NPP_StreamAsFile goto ALIVE;
+  send NPP_DestroyStream goto ALIVE;
+  answer NPN_RequestRead goto ALIVE;
+  recv NPN_DestroyStream goto DYING;
+
+state DYING:
+  answer NPN_RequestRead goto DYING;
+  recv NPN_DestroyStream goto DYING;
+  recv StreamDestroyed goto DELETING;
+
+state DELETING:
+  send __delete__;
+*/
+};
+
+} // namespace plugins
+} // namespace mozilla