Fix precedence of ternary operators in polymer expressions

pkg/polymer_expressions/lib/parser.dart

Index: pkg/polymer_expressions/lib/parser.dart
diff --git a/pkg/polymer_expressions/lib/parser.dart b/pkg/polymer_expressions/lib/parser.dart
index bf8dd66b87071b4ed9a6123fa54d2df9a4c8d312..411c7ae0be5c5827bdc0b566ef37bf2e1830f8f8 100644
--- a/pkg/polymer_expressions/lib/parser.dart
+++ b/pkg/polymer_expressions/lib/parser.dart
@@ -66,11 +66,9 @@ class Parser {
         left = _makeInvokeOrGetter(left, right);
       } else if (_token.kind == KEYWORD_TOKEN && _token.value == 'in') {
         left = _parseComprehension(left);
-      } else if (_token.kind == OPERATOR_TOKEN && _token.value == '?') {
-        left = _parseTernary(left);
       } else if (_token.kind == OPERATOR_TOKEN
           && _token.precedence >= precedence) {
-        left = _parseBinary(left);
+        left = _token.value == '?' ? _parseTernary(left) : _parseBinary(left);
       } else {
         break;
       }