Whitespace testing fixes and bit-flip to turn on simple line breaking.

pkg/analyzer/test/services/formatter_test.dart

Index: pkg/analyzer/test/services/formatter_test.dart
===================================================================
--- pkg/analyzer/test/services/formatter_test.dart	(revision 31766)
+++ pkg/analyzer/test/services/formatter_test.dart	(working copy)
@@ -1297,6 +1297,19 @@
       expect(line, 'foo bar baz\nfoo bar baz');
     });
 
+    test('isWhitespace', () {
+      expect(isWhitespace('foo'), false);
+      expect(isWhitespace('  foo'), false);
+      expect(isWhitespace('foo  '), false);
+      expect(isWhitespace(' foo '), false);
+      expect(isWhitespace(' '), true);
+      expect(isWhitespace('  '), true);
+      expect(isWhitespace('\t'), true);
+      expect(isWhitespace('\t\t'), true);
+      expect(isWhitespace('\n'), true);
+      expect(isWhitespace('\r'), true);
+    });
+
   });
 
   /// Helper method tests