Smarter splitting around named collection arguments.

test/regression/0100/0162.stmt

 >>>
 void main() {
   useGeneratedCode(new StaticConfiguration(
       checkedMode: false,
       parents: {
         smoke_0.A: smoke_1.PolymerElement,
         smoke_0.B: smoke_0.A,
         smoke_0.C: smoke_0.B,
         smoke_0.D: smoke_0.B,
         smoke_0.E: smoke_0.C,
@@ skipping 10 matching lines @@
       () => Polymer.register('x-a', i0.A),
       () => Polymer.register('x-b', i0.B),
       () => Polymer.register('x-d', i0.D),
       () => Polymer.register('x-c', i0.C),
       () => Polymer.register('x-e', i0.E),
     ]);
   i0.main();
 }
 <<<
 void main() {
-  useGeneratedCode(new StaticConfiguration(
-      checkedMode: false,
-      parents: {
-        smoke_0.A: smoke_1.PolymerElement,
-        smoke_0.B: smoke_0.A,
-        smoke_0.C: smoke_0.B,
-        smoke_0.D: smoke_0.B,
-        smoke_0.E: smoke_0.C,
-      },
-      declarations: {
-        smoke_0.A: {},
-        smoke_0.B: {},
-        smoke_0.C: {},
-        smoke_0.D: {},
-        smoke_0.E: {},
-      }));
+  useGeneratedCode(new StaticConfiguration(checkedMode: false, parents: {
+    smoke_0.A: smoke_1.PolymerElement,
+    smoke_0.B: smoke_0.A,
+    smoke_0.C: smoke_0.B,
+    smoke_0.D: smoke_0.B,
+    smoke_0.E: smoke_0.C,
+  }, declarations: {
+    smoke_0.A: {},
+    smoke_0.B: {},
+    smoke_0.C: {},
+    smoke_0.D: {},
+    smoke_0.E: {},
+  }));
   new LogInjector().injectLogsFromUrl('sort_registration_test.html._buildLogs');
   configureForDeployment([
     () => Polymer.register('x-a', i0.A),
     () => Polymer.register('x-b', i0.B),
     () => Polymer.register('x-d', i0.D),
     () => Polymer.register('x-c', i0.C),
     () => Polymer.register('x-e', i0.E),
   ]);
   i0.main();
 }
 >>> (indent 4)
     final server = new DatastoreLocalDevServer('connect',
         workingDirectory: path.join(
             packageRoot().absolute.path, 'test/tmp_data'),
         environment: <String, String>{
             'JAVA': '/usr/lib/jvm/java-7-openjdk-amd64/bin/java'},
         minUpTimeBeforeShutdown: new Duration(seconds: 0));
 <<<
     final server = new DatastoreLocalDevServer('connect',
         workingDirectory:
             path.join(packageRoot().absolute.path, 'test/tmp_data'),
         environment: <String, String>{
           'JAVA': '/usr/lib/jvm/java-7-openjdk-amd64/bin/java'
         },
         minUpTimeBeforeShutdown: new Duration(seconds: 0));