Fix dart2js decimal number tokenization.

tests/language/number_identifier_test.dart

Index: tests/language/number_identifier_test.dart
diff --git a/tests/language/number_identifier_test.dart b/tests/language/number_identifier_test.dart
index 9ef17d874575025e4601a159999d180d3abe82dc..ab5ac206717d9a352e8283b967ddc2760eba8dce 100644
--- a/tests/language/number_identifier_test.dart
+++ b/tests/language/number_identifier_test.dart
@@ -31,6 +31,14 @@ main() {
   Expect.equals(1e+2, 1e+2as double);
   Expect.throws(() => 1.e+2,                       /// 05: ok
                 (e) => e is NoSuchMethodError);    /// 05: continued
+  1d;  /// 06: compile-time error
+  1D;  /// 07: compile-time error
+  Expect.throws(() => 1.d+2,                       /// 08: ok
+                (e) => e is NoSuchMethodError);    /// 08: continued
+  Expect.throws(() => 1.D+2,                       /// 09: ok
+                (e) => e is NoSuchMethodError);    /// 09: continued
+  1.1d;  /// 10: compile-time error
+  1.1D;  /// 11: compile-time error
   1e;  /// 02: compile-time error
   1x;  /// 03: compile-time error
 }