Roll Observatory packages and add a roll script

packages/dart_style/test/regression/0100/0111.unit

+>>>
+class MyClassLongName {
+    MyClassLongName(Argument arg1, Argument arg2, Argument arg3) :
+      super.con1(arg1, arg2, arg3,
+          namedArgument: (r) => new FooClassLongName(r));
+}
+
+class MyClassVeryVeryLongName {
+    MyClassVeryVeryLongName(
+        Argument arg1, Argument arg2, Argument arg3, Argument arg4)
+      : super.con1(arg1, arg2, arg3,
+          namedArgument: (r) => new FooClassLongName(r));
+}
+<<<
+class MyClassLongName {
+  MyClassLongName(Argument arg1, Argument arg2, Argument arg3)
+      : super.con1(arg1, arg2, arg3,
+            namedArgument: (r) => new FooClassLongName(r));
+}
+
+class MyClassVeryVeryLongName {
+  MyClassVeryVeryLongName(
+      Argument arg1, Argument arg2, Argument arg3, Argument arg4)
+      : super.con1(arg1, arg2, arg3,
+            namedArgument: (r) => new FooClassLongName(r));
+}