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diff --git a/chromium/ui/base/mojom/attributed_string.mojom b/chromium/ui/base/mojom/attributed_string.mojom
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+++ b/chromium/ui/base/mojom/attributed_string.mojom
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+// Copyright 2020 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 ui.mojom;
+
+import "mojo/public/mojom/base/string16.mojom";
+import "ui/gfx/range/mojom/range.mojom";
+
+// This will serialize the font information of an NSAttributedString so that
+// it can be sent over mojo. This only stores the information of the
+// NSFontAttributeName. The motive is that of security: using NSArchiver and
+// friends to send objects from the renderer to the browser could lead to
+// deserialization of arbitrary objects. This restricts serialization to a
+// specific object class and specific attributes of that object.
+
+// A C++ mojo-friendly representation of the NSFontAttributeName attribute
+// set.
+struct FontAttribute {
+  mojo_base.mojom.String16 font_name;
+  float font_point_size;
+  gfx.mojom.Range effective_range;
+};
+
+// A struct that contains the pertinent information from an NSAttributedString,
+// which can be serialized over mojo.
+struct AttributedString {
+  // The plain-text string.
+  mojo_base.mojom.String16 string;
+  // The set of attributes that style |string|.
+  array<FontAttribute> attributes;
+};