Support for parsing all CSS and producing one CSS file

lib/src/info.dart

Index: lib/src/info.dart
diff --git a/lib/src/info.dart b/lib/src/info.dart
index c38468e46596f126d59ec5f5799952311e48136d..9c8ac38f5d77d316b6274559022982b96058f9b8 100644
--- a/lib/src/info.dart
+++ b/lib/src/info.dart
@@ -198,11 +198,8 @@ abstract class LibraryInfo extends Hashable {
   /** File where the top-level code was defined. */
   Path get inputPath;
 
-  /** Stylesheet with <style>...</style> */
-  StringBuffer cssSource = new StringBuffer();
-
   /** Parsed cssSource. */
-  StyleSheet styleSheet;
+  List<StyleSheet> styleSheets = [];
 
   /**
    * Name of the file that will hold any generated Dart code for this library
@@ -276,6 +273,9 @@ class FileInfo extends LibraryInfo {
   /** Files imported with `<link rel="component">` */
   final List<Path> componentLinks = <Path>[];
 
+  /** Files imported with `<link rel="stylesheet">` */
+  final List<Path> styleSheetHref = <Path>[];
+
   /** Root is associated with the body info. */
   ElementInfo bodyInfo;