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

ui/gfx/render_text_harfbuzz.h

 // Copyright 2014 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 UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 #define UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 222 matching lines @@
   void EnsureLayoutRunList();
 
   // ICU grapheme iterator for the layout text. Can be NULL in case of an error.
   base::i18n::BreakIterator* GetGraphemeIterator();
 
   // Returns the current run list, |display_run_list_| if the text is
   // elided, or |layout_run_list_| otherwise.
   internal::TextRunList* GetRunList();
   const internal::TextRunList* GetRunList() const;
 
+  // RenderText:
+  bool GetDecoratedTextForRange(const Range& range,
+                                DecoratedText* decorated_text) override;
+
   // Text run list for |layout_text_| and |display_text_|.
   // |display_run_list_| is created only when the text is elided.
   internal::TextRunList layout_run_list_;
   std::unique_ptr<internal::TextRunList> display_run_list_;
 
   bool update_layout_run_list_ : 1;
   bool update_display_run_list_ : 1;
   bool update_grapheme_iterator_ : 1;
   bool update_display_text_ : 1;
 
   // ICU grapheme iterator for the layout text. Use GetGraphemeIterator()
   // to access the iterator.
   std::unique_ptr<base::i18n::BreakIterator> grapheme_iterator_;
 
   // The total size of the layouted text.
   SizeF total_size_;
 
   // Fixed width of glyphs. This should only be set in test environments.
   float glyph_width_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_HARFBUZZ_H_