Bug 570620, part j: Add a PRenderFrame protocol for cross-process frame objects. r=tn

layout/ipc/PRenderFrame.ipdl

@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at:
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Code.
+ *
+ * The Initial Developer of the Original Code is
+ *   The Mozilla Foundation
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Chris Jones <jones.chris.g@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+include protocol PBrowser;
+include protocol PLayers;
+
+namespace mozilla {
+namespace layout {
+
+/**
+ * PRenderFrame (in the layout sense of "frame") represents one web
+ * "page".  It's used to graft content processes' layer trees into
+ * chrome's rendering path.  The lifetime of a PRenderFrame is tied to
+ * its PresShell in the child process.
+ *
+ * The child process conceptually "owns" a PRenderFrame, because it
+ * only makes sense wrt documents loaded by the child.
+ */
+sync protocol PRenderFrame
+{
+    manager PBrowser;
+    manages PLayers;
+
+parent:
+    async PLayers();
+    async __delete__();
+
+state EMPTY:
+    recv PLayers goto HAVE_CONTENT;
+state HAVE_CONTENT:
+    recv __delete__;
+};
+
+} // namespace layout
+} // namespace mozilla