Empty reflected attributes and string literals in extended attributes.

Source/bindings/scripts/idl_parser.pm

Index: Source/bindings/scripts/idl_parser.pm
diff --git a/Source/bindings/scripts/idl_parser.pm b/Source/bindings/scripts/idl_parser.pm
index 67ea502b7d1f2f82a2b9bd6c9e64d07023d0ed88..3ede609bbebb4f0a946707a7f396d617b25479c9 100644
--- a/Source/bindings/scripts/idl_parser.pm
+++ b/Source/bindings/scripts/idl_parser.pm
@@ -1620,6 +1620,12 @@ sub parseExtendedAttributeRest2
         my $token = $self->getToken();
         return $token->value();
     }
+    # A Blink syntactic extension to allow string literals.
+    # The string quotes aren't kept.
+    if ($next->type() == StringToken) {
+        my $token = $self->getToken();
+        return $self->parseExtendedAttributeRest3($self->unquoteString($token->value()));
+    }
     $self->assertUnexpectedToken($next->value(), __LINE__);
 }