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>
 
 #include <algorithm>
 #include <cmath>
 #include <utility>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "skia/ext/skia_utils_mac.h"
 #include "third_party/skia/include/ports/SkTypeface_mac.h"
+#include "ui/gfx/decorated_text.h"
 
 namespace {
 
 // This function makes a copy of |font| with the given symbolic traits. On OSX
 // 10.11, CTFontCreateCopyWithSymbolicTraits has the right behavior but
 // CTFontCreateWithFontDescriptor does not. The opposite holds true for OSX
 // 10.10.
 base::ScopedCFTypeRef<CTFontRef> CopyFontWithSymbolicTraits(CTFontRef font,
                                                             int sym_traits) {
   if (base::mac::IsAtLeastOS10_11()) {
@@ skipping 408 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) {
+  // TODO(karandeepb): This is not invoked on any codepath currently. Style the
+  // returned text if need be.
+  if (obscured())
+    return false;
+
+  decorated_text->text = GetTextFromRange(range);
+  return true;
+}
+
 }  // namespace gfx