Use element id's for animations

third_party/WebKit/Source/platform/graphics/CompositorElementId.cpp

Index: third_party/WebKit/Source/platform/graphics/CompositorElementId.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/CompositorElementId.cpp b/third_party/WebKit/Source/platform/graphics/CompositorElementId.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a86835a42fe81214ed3c4f52744e3e8e04941b90
--- /dev/null
+++ b/third_party/WebKit/Source/platform/graphics/CompositorElementId.cpp
@@ -0,0 +1,14 @@
+// Copyright 2016 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 "platform/graphics/CompositorElementId.h"
+
+namespace blink {
+
+CompositorElementId createCompositorElementId(int domNodeId, CompositorSubElementId subElementId)
+{
+    return CompositorElementId(domNodeId, static_cast<int>(subElementId));
+}
+
+} // namespace blink