Add SurfaceSequence mojom file to cc/ipc and edit corresponding GYP file

cc/ipc/surface_sequence_struct_traits.h

+// 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.
+
+#ifndef CC_IPC_SURFACE_SEQUENCE_STRUCT_TRAITS_H_
+#define CC_IPC_SURFACE_SEQUENCE_STRUCT_TRAITS_H_
+
+#include "cc/ipc/surface_sequence.mojom.h"
+#include "cc/surfaces/surface_sequence.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<cc::mojom::SurfaceSequence, cc::SurfaceSequence> {
+  static uint32_t id_namespace(const cc::SurfaceSequence& id) {
+    return id.id_namespace;
+  }
+
+  static uint32_t sequence(const cc::SurfaceSequence& id) {
+    return id.sequence;
+  }
+
+  static bool Read(cc::mojom::SurfaceSequenceDataView data,
+                   cc::SurfaceSequence* out) {
+    *out = cc::SurfaceSequence(data.id_namespace(), data.sequence());
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // CC_IPC_SURFACE_SEQUENCE_STRUCT_TRAITS_H_