Initial indent fix and a few more tests.

pkg/analyzer_experimental/lib/src/services/writer.dart

Index: pkg/analyzer_experimental/lib/src/services/writer.dart
===================================================================
--- pkg/analyzer_experimental/lib/src/services/writer.dart	(revision 24818)
+++ pkg/analyzer_experimental/lib/src/services/writer.dart	(working copy)
@@ -78,13 +78,14 @@
 class SourceWriter {
 
   final StringBuffer buffer = new StringBuffer();
-  Line currentLine = new Line();
+  Line currentLine;
 
   final String lineSeparator;
   int indentCount = 0;
 
-  SourceWriter({int initialIndent: 0, this.lineSeparator: '\n'}) :
-    indentCount = initialIndent;
+  SourceWriter({this.indentCount: 0, this.lineSeparator: '\n'}) {
+    currentLine = new Line(indent: indentCount);
+  }
 
   indent() {
     ++indentCount;