Introduce cc::LocalFrameId and use in SurfaceFactory

cc/ipc/local_frame_id_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_LOCAL_FRAME_ID_STRUCT_TRAITS_H_
+#define CC_IPC_LOCAL_FRAME_ID_STRUCT_TRAITS_H_
+
+#include "cc/ipc/local_frame_id.mojom-shared.h"
+#include "cc/surfaces/local_frame_id.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<cc::mojom::LocalFrameIdDataView, cc::LocalFrameId> {
+  static uint32_t local_id(const cc::LocalFrameId& local_frame_id) {
+    return local_frame_id.local_id();
+  }
+
+  static uint64_t nonce(const cc::LocalFrameId& local_frame_id) {
+    return local_frame_id.nonce();
+  }
+
+  static bool Read(cc::mojom::LocalFrameIdDataView data,
+                   cc::LocalFrameId* out) {
+    *out = cc::LocalFrameId(data.local_id(), data.nonce());
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // CC_IPC_LOCAL_FRAME_ID_STRUCT_TRAITS_H_