MacViews: Implement Force Touch/Mac dictionary lookup for Textfields.

ui/gfx/decorated_text.cc

+// 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 "ui/gfx/decorated_text.h"
+
+namespace gfx {
+
+DecoratedText::RangedAttribute::RangedAttribute(const gfx::Range& range,
+                                                const gfx::Font& font)
+    : range(range),
+      font(font),
+      weight(Font::Weight::INVALID),
+      underline(false),
+      italic(false),
+      strike(false),
+      diagonal_strike(false) {}
+
+DecoratedText::DecoratedText() {}
+
+DecoratedText::~DecoratedText() {}
+
+}  // namespace gfx