import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

gfx/ipc/PVsyncBridge.ipdl

@@ -0,0 +1,22 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+using class mozilla::TimeStamp from "mozilla/TimeStamp.h";
+
+namespace mozilla {
+namespace gfx {
+
+// This protocol only serves one purpose: deliver vsync notifications from a
+// dedicated thread in the UI process to the compositor thread in the
+// compositor process. The child side exists in the UI process, and the
+// parent side in the GPU process.
+sync protocol PVsyncBridge
+{
+parent:
+  async NotifyVsync(TimeStamp vsyncTimeStamp, uint64_t layersId);
+};
+
+} // namespace gfx
+} // namespace mozilla