Support underline on Linux again.

ui/gfx/platform_font_linux.h

 // 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.
 
 #ifndef UI_GFX_PLATFORM_FONT_LINUX_H_
 #define UI_GFX_PLATFORM_FONT_LINUX_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 42 matching lines @@
   std::string GetActualFontNameForTesting() const override;
   int GetFontSize() const override;
   const FontRenderParams& GetFontRenderParams() override;
 
  private:
   // Create a new instance of this object with the specified properties. Called
   // from DeriveFont.
   PlatformFontLinux(sk_sp<SkTypeface> typeface,
                     const std::string& family,
                     int size_pixels,
-                    bool italic,
+                    int style,
                     Font::Weight weight,
                     const FontRenderParams& params);
   ~PlatformFontLinux() override;
 
   // Initializes this object based on the passed-in details. If |typeface| is
   // empty, a new typeface will be loaded.
   void InitFromDetails(
       sk_sp<SkTypeface> typeface,
       const std::string& font_family,
       int font_size_pixels,
-      bool italic,
+      int style,
       Font::Weight weight,
       const FontRenderParams& params);
 
   // Initializes this object as a copy of another PlatformFontLinux.
   void InitFromPlatformFont(const PlatformFontLinux* other);
 
   // Computes the metrics if they have not yet been computed.
   void ComputeMetricsIfNecessary();
 
   sk_sp<SkTypeface> typeface_;
 
   // Additional information about the face.
   // Skia actually expects a family name and not a font name.
   std::string font_family_;
   int font_size_pixels_;
-  bool italic_;
+  int style_;
   float device_scale_factor_;
 
   // Information describing how the font should be rendered.
   FontRenderParams font_render_params_;
 
   // Cached metrics, generated on demand.
   bool metrics_need_computation_ = true;
   int ascent_pixels_;
   int height_pixels_;
   int cap_height_pixels_;
   double average_width_pixels_;
   Font::Weight weight_;
 
 #if defined(OS_CHROMEOS)
   // A font description string of the format used by FontList.
   static std::string* default_font_description_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontLinux);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_LINUX_H_