Initial patch for FontVariant, variant like HalfWidth should take Complex Path

Source/platform/fonts/harfbuzz/HarfBuzzShaper.cpp

 /*
  * Copyright (c) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 BlackBerry Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 504 matching lines @@
     case FontDescription::DisabledLigaturesState:
         m_features.append(noCalt);
         break;
     case FontDescription::EnabledLigaturesState:
         // calt is on by default
         break;
     case FontDescription::NormalLigaturesState:
         break;
     }
 
+    static hb_feature_t hwid = { HB_TAG('h', 'w', 'i', 'd'), 1, 0, static_cast<unsigned>(-1) };
+    static hb_feature_t twid = { HB_TAG('t', 'w', 'i', 'd'), 1, 0, static_cast<unsigned>(-1) };
+    static hb_feature_t qwid = { HB_TAG('d', 'w', 'i', 'd'), 1, 0, static_cast<unsigned>(-1) };
+    switch (description.widthVariant()) {
+    case HalfWidth:
+        m_features.append(hwid);
+        break;
+    case ThirdWidth:
+        m_features.append(twid);
+        break;
+    case QuarterWidth:
+        m_features.append(qwid);
+        break;
+    case RegularWidth:
+        break;
+    }
+
     FontFeatureSettings* settings = description.featureSettings();
     if (!settings)
         return;
 
     unsigned numFeatures = settings->size();
     for (unsigned i = 0; i < numFeatures; ++i) {
         hb_feature_t feature;
         const AtomicString& tag = settings->at(i).tag();
         feature.tag = HB_TAG(tag[0], tag[1], tag[2], tag[3]);
         feature.value = settings->at(i).value();
@@ skipping 589 matching lines @@
             point.x() + fromX, point.x() + toX,
             point.y(), height);
     }
 
     return Font::pixelSnappedSelectionRect(
         point.x() + toX, point.x() + fromX,
         point.y(), height);
 }
 
 } // namespace blink