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..9b2c249db6f61176633b549b6921d987a9abc24d
--- /dev/null
+++ b/third_party/WebKit/Source/platform/graphics/CompositorElementId.cpp
@@ -0,0 +1,16 @@
+// 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::Value subElementId)
+{
+    uint64_t value = domNodeId;
+    value |= static_cast<uint64_t>(subElementId) << 32UL;
+    return CompositorElementId(value);
+}
+
+} // namespace blink