Allow various font weights in gfx.

ui/gfx/font.h

Index: ui/gfx/font.h
diff --git a/ui/gfx/font.h b/ui/gfx/font.h
index b7a7f9da4bde09a46d90a5d22ff72562e5bfe7f9..6386aab1f191660893873c1f5384f8f905ac2fa4 100644
--- a/ui/gfx/font.h
+++ b/ui/gfx/font.h
@@ -34,9 +34,21 @@ class GFX_EXPORT Font {
   // The following constants indicate the font style.
   enum FontStyle {
     NORMAL = 0,
-    BOLD = 1,
-    ITALIC = 2,
-    UNDERLINE = 4,
+    ITALIC = 1,
+    UNDERLINE = 2,
+  };
+
+  enum FontWeight {

[sky, 2016/03/21 17:13:22]

enum class and just Weight. When you move to enum class you can get rid of
WEIGHT_ in the name too. So, bold becomes Font::Weight::BOLD.

+    WEIGHT_INVALID = -1,
+    WEIGHT_THIN = 100,
+    WEIGHT_EXTRA_LIGHT = 200,
+    WEIGHT_LIGHT = 300,
+    WEIGHT_NORMAL = 400,
+    WEIGHT_MEDIUM = 500,
+    WEIGHT_SEMIBOLD = 600,
+    WEIGHT_BOLD = 700,
+    WEIGHT_EXTRA_BOLD = 800,
+    WEIGHT_BLACK = 900
   };
 
   // Creates a font with the default name and style.
@@ -64,8 +76,8 @@ class GFX_EXPORT Font {
   // |size_delta| is the size in pixels to add to the current font. For example,
   // a value of 5 results in a font 5 pixels bigger than this font.
   // The style parameter specifies the new style for the font, and is a
-  // bitmask of the values: BOLD, ITALIC and UNDERLINE.
-  Font Derive(int size_delta, int style) const;
+  // bitmask of the values: ITALIC and UNDERLINE.
+  Font Derive(int size_delta, int style, gfx::Font::FontWeight weight) const;
 
   // Returns the number of vertical pixels needed to display characters from
   // the specified font.  This may include some leading, i.e. height may be
@@ -74,6 +86,9 @@ class GFX_EXPORT Font {
   // need to be revisited in the future.
   int GetHeight() const;
 
+  // Returns the font weight.
+  gfx::Font::FontWeight GetWeight() const;
+
   // Returns the baseline, or ascent, of the font.
   int GetBaseline() const;