Export parse_color_keyword for use in legacy HTML color parsing.

I could have gotten around the privacy restriction by synthesizing a
fake CSS AST and parsing that, but that would have been less efficient.

Author: pcwalton

src/color.rs

@@ -61,7 +61,7 @@ impl Color {
 
 
 #[inline]
-fn parse_color_keyword(value: &str) -> Result<Color, ()> {
+pub fn parse_color_keyword(value: &str) -> Result<Color, ()> {
     let lower_value = value.to_ascii_lower();
     let (r, g, b) = match lower_value.as_slice() {
         "black" => (0., 0., 0.),

src/lib.rs

@@ -21,7 +21,7 @@ pub use parser::{parse_stylesheet_rules, StylesheetParser,
                  parse_declaration_list, DeclarationListParser,
                  parse_one_rule, parse_one_declaration, parse_one_component_value};
 pub use from_bytes::{decode_stylesheet_bytes, parse_stylesheet_rules_from_bytes};
-pub use color::{RGBA, Color, CurrentColor, RGBAColor};
+pub use color::{RGBA, Color, CurrentColor, RGBAColor, parse_color_keyword};
 pub use nth::parse_nth;
 pub use serializer::{ToCss, serialize_identifier, serialize_string};