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

ui/gfx/render_text_harfbuzz.cc

Index: ui/gfx/render_text_harfbuzz.cc
diff --git a/ui/gfx/render_text_harfbuzz.cc b/ui/gfx/render_text_harfbuzz.cc
index d0b3dd7200278cbaadb91c086ddda01ec5a6638b..891cf6609cd71a9756fa594fee199c490285eee2 100644
--- a/ui/gfx/render_text_harfbuzz.cc
+++ b/ui/gfx/render_text_harfbuzz.cc
@@ -1590,4 +1590,43 @@ const internal::TextRunList* RenderTextHarfBuzz::GetRunList() const {
   return const_cast<RenderTextHarfBuzz*>(this)->GetRunList();
 }
 
+bool RenderTextHarfBuzz::GetDecoratedTextForRange(
+    const Range& range,
+    DecoratedText* decorated_text) const {
+  if (obscured())
+    return false;
+
+  decorated_text->attributes.clear();
+  decorated_text->text = GetTextFromRange(range);
+
+  const internal::TextRunList* run_list = GetRunList();
+  for (size_t i = 0; i < run_list->size(); i++) {
+    const internal::TextRunHarfBuzz& run = *run_list->runs()[i];
+
+    const Range intersection = range.Intersect(run.range);
+    DCHECK(!intersection.is_reversed());
+
+    if (!intersection.is_empty()) {
+      int style = Font::NORMAL;
+      if (run.italic)
+        style |= Font::ITALIC;
+      if (run.underline)
+        style |= Font::UNDERLINE;
+
+      Font font_with_style = run.font.Derive(0, style, run.weight);
+
+      // Get range relative to the decorated text.
+      DecoratedText::RangedAttribute attribute(
+          gfx::Range(intersection.start() - range.GetMin(),
+                     intersection.end() - range.GetMin()),
+          font_with_style);
+
+      attribute.strike = run.strike;
+      attribute.diagonal_strike = run.diagonal_strike;
+      decorated_text->attributes.push_back(attribute);
+    }
+  }
+  return true;
+}
+
 }  // namespace gfx