Updates subpixel positioning and hinting when DSF is changed

ui/gfx/render_text_harfbuzz.cc

 // 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.
 
 #include "ui/gfx/render_text_harfbuzz.h"
 
 #include <limits>
 #include <map>
 
 #include "base/i18n/bidi_line_iterator.h"
@@ skipping 1144 matching lines @@
     if (family == primary_family)
       continue;
 #if defined(OS_WIN)
     if (family == uniscribe_family)
       continue;
 #endif
     FontRenderParamsQuery query(false);
     query.families.push_back(family);
     query.pixel_size = run->font_size;
     query.style = run->font_style;
-    FontRenderParams fallback_render_params = GetFontRenderParams(query, NULL);
+    FontRenderParams fallback_render_params =
+        GetCurrentFontRenderParams(query, NULL);
     if (CompareFamily(run, family, fallback_render_params, &best_family,
                       &best_render_params, &best_missing_glyphs))
       return;
   }
 
   if (!best_family.empty() &&
       (best_family == run->family ||
        ShapeRunWithFont(run, best_family, best_render_params)))
     return;
 
@@ skipping 58 matching lines @@
     if (!run->render_params.subpixel_positioning)
       run->width = std::floor(run->width + 0.5f);
   }
 
   hb_buffer_destroy(buffer);
   hb_font_destroy(harfbuzz_font);
   return true;
 }
 
 }  // namespace gfx