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

ui/gfx/render_text_mac.mm

 // Copyright (c) 2012 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/render_text_mac.h"
 
 #import <AppKit/AppKit.h>
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreText/CoreText.h>
 
@@ skipping 430 matching lines @@
   runs_valid_ = true;
 }
 
 void RenderTextMac::InvalidateStyle() {
   line_.reset();
   attributes_.reset();
   runs_.clear();
   runs_valid_ = false;
 }
 
+bool RenderTextMac::GetDecoratedTextForRange(
+    const Range& range,
+    DecoratedText* decorated_text) const {
+  // TODO(karandeepb): This is not invoked on any codepath currently. Style the
+  // returned text if need be.
+  if (obscured())
+    return false;
+
+  decorated_text->attributes.clear();

[msw, 2016/10/04 01:52:37]

q: is this necessary?

[karandeepb, 2016/10/04 12:04:24]

Not really, removed.

+  decorated_text->text = GetTextFromRange(range);
+  return true;
+}
+
 }  // namespace gfx