Allow various font weights in gfx.

ui/gfx/font.cc

Index: ui/gfx/font.cc
diff --git a/ui/gfx/font.cc b/ui/gfx/font.cc
index 60a7acd424f5f12193b30dd2e62ad5440269c0d2..b4f1371bcb56cd1c9f0276e1ecb0ef99984e11e0 100644
--- a/ui/gfx/font.cc
+++ b/ui/gfx/font.cc
@@ -41,8 +41,10 @@ Font::Font(const std::string& font_name, int font_size)
 Font::~Font() {
 }
 
-Font Font::Derive(int size_delta, int style) const {
-  return platform_font_->DeriveFont(size_delta, style);
+Font Font::Derive(int size_delta,
+                  int style,
+                  gfx::Font::FontWeight weight) const {
+  return platform_font_->DeriveFont(size_delta, style, weight);
 }
 
 int Font::GetHeight() const {
@@ -77,6 +79,10 @@ int Font::GetFontSize() const {
   return platform_font_->GetFontSize();
 }
 
+gfx::Font::FontWeight Font::GetWeight() const {
+  return platform_font_->GetWeight();
+}
+
 const FontRenderParams& Font::GetFontRenderParams() const {
   return platform_font_->GetFontRenderParams();
 }