Initial parser changes for the new directive syntax

compiler/java/com/google/dart/compiler/ast/DartLibraryDirective.java

Index: compiler/java/com/google/dart/compiler/ast/DartLibraryDirective.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/DartLibraryDirective.java	(revision 10597)
+++ compiler/java/com/google/dart/compiler/ast/DartLibraryDirective.java	(working copy)
@@ -8,16 +8,32 @@
  * Implements the #library directive.
  */
 public class DartLibraryDirective extends DartDirective {
-  private DartStringLiteral name;
+  private DartExpression name;
 
-  public DartLibraryDirective(DartStringLiteral name) {
+  public DartLibraryDirective(DartExpression name) {
     this.name = becomeParentOf(name);
   }
 
-  public DartStringLiteral getName() {
+  public DartExpression getName() {
     return name;
   }
 
+  public String getLibraryName() {
+    if (name == null) {
+      return null;
+    } else if (name instanceof DartStringLiteral) {
+      // TODO(brianwilkerson) Remove this case once the obsolete format is no longer supported.
+      return ((DartStringLiteral) name).getValue();
+    } else {
+      return name.toSource();
+    }
+  }
+
+  public boolean isObsoleteFormat() {
+    // TODO(brianwilkerson) Remove this method once the obsolete format is no longer supported.
+    return name instanceof DartStringLiteral;
+  }
+
   @Override
   public void visitChildren(ASTVisitor<?> visitor) {
     safelyVisitChild(name, visitor);