Allow various font weights in gfx.

ui/gfx/platform_font_linux.h

Index: ui/gfx/platform_font_linux.h
diff --git a/ui/gfx/platform_font_linux.h b/ui/gfx/platform_font_linux.h
index 52c4bceb76e82e590d5cd4aaa158a19a29b5b4ad..da5d3445cd6514e59771e21ae6e158e92847e6e9 100644
--- a/ui/gfx/platform_font_linux.h
+++ b/ui/gfx/platform_font_linux.h
@@ -41,8 +41,11 @@ class GFX_EXPORT PlatformFontLinux : public PlatformFont {
 #endif
 
   // Overridden from PlatformFont:
-  Font DeriveFont(int size_delta, int style) const override;
+  Font DeriveFont(int size_delta,
+                  int style,
+                  gfx::Font::FontWeight weight) const override;
   int GetHeight() override;
+  gfx::Font::FontWeight GetWeight() override;
   int GetBaseline() override;
   int GetCapHeight() override;
   int GetExpectedTextWidth(int length) override;
@@ -59,17 +62,18 @@ class GFX_EXPORT PlatformFontLinux : public PlatformFont {
                     const std::string& family,
                     int size_pixels,
                     int style,
+                    gfx::Font::FontWeight 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(
-      const skia::RefPtr<SkTypeface>& typeface,
-      const std::string& font_family,
-      int font_size_pixels,
-      int style,
-      const FontRenderParams& params);
+  void InitFromDetails(const skia::RefPtr<SkTypeface>& typeface,
+                       const std::string& font_family,
+                       int font_size_pixels,
+                       int style,
+                       gfx::Font::FontWeight weight,
+                       const FontRenderParams& params);
 
   // Initializes this object as a copy of another PlatformFontLinux.
   void InitFromPlatformFont(const PlatformFontLinux* other);
@@ -97,6 +101,7 @@ class GFX_EXPORT PlatformFontLinux : public PlatformFont {
   int height_pixels_;
   int cap_height_pixels_;
   double average_width_pixels_;
+  gfx::Font::FontWeight weight_;
 
 #if defined(OS_CHROMEOS)
   // A font description string of the format used by gfx::FontList.