Allow a NumberFormat to be passed a currency name/symbol at creation

pkg/intl/test/number_format_test.dart

Index: pkg/intl/test/number_format_test.dart
diff --git a/pkg/intl/test/number_format_test.dart b/pkg/intl/test/number_format_test.dart
index 07f1db14b06f1831e68774e029526fc2eb9fc2c7..064933df8c8249e56413606c379b4c25ef65bfd4 100644
--- a/pkg/intl/test/number_format_test.dart
+++ b/pkg/intl/test/number_format_test.dart
@@ -94,4 +94,27 @@ main() {
       expect(formatted, x);
     }
   });
+
+  test('Explicit currency name', () {
+    var amount = 1000000.32;
+    var usConvention = new NumberFormat.currencyPattern('en_US', '€');
+    var formatted = usConvention.format(amount);
+    expect(formatted, '€1,000,000.32');
+    var swissConvention = new NumberFormat.currencyPattern('de_CH', r'$');
+    formatted = swissConvention.format(amount);
+    var nbsp = new String.fromCharCode(0xa0);
+    expect(formatted, r"$" + nbsp + "1'000'000.32");
+
+    /// Verify we can leave off the currency and it gets filled in.
+    var plainSwiss = new NumberFormat.currencyPattern('de_CH');
+    formatted = plainSwiss.format(amount);
+    expect(formatted, r"CHF" + nbsp + "1'000'000.32");
+
+    // Verify that we can pass null in order to specify the currency symbol
+    // but use the default locale.
+    var defaultLocale = new NumberFormat.currencyPattern(null, 'Smurfs');
+    formatted = defaultLocale.format(amount);
+    // We don't know what the exact format will be, but it should have Smurfs.
+    expect(formatted.contains('Smurfs'), isTrue);
+  });
 }