Implement cc::Selection<gfx::SelectionBound> StructTraits

cc/ipc/selection.mojom

Index: cc/ipc/selection.mojom
diff --git a/cc/ipc/selection.mojom b/cc/ipc/selection.mojom
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+// 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.
+
+module cc.mojom;
+
+import "ui/gfx/mojo/selection_bound.mojom";
+
+// See cc/input/selection.h.
+struct Selection {
+  gfx.mojom.SelectionBound start;
+  gfx.mojom.SelectionBound end;
+  bool is_editable;
+  bool is_empty_text_form_control;
+};
+