Polymer transformer logs now show on the frontend for pub serve.

pkg/polymer/lib/transformer.dart

Index: pkg/polymer/lib/transformer.dart
diff --git a/pkg/polymer/lib/transformer.dart b/pkg/polymer/lib/transformer.dart
index ebbfc121ffe04e013192ee15c417ad1f6051dc87..aee4b1d7c623ee0fcdc56bd9a04498741c33a716 100644
--- a/pkg/polymer/lib/transformer.dart
+++ b/pkg/polymer/lib/transformer.dart
@@ -8,10 +8,12 @@ library polymer.transformer;
 import 'package:barback/barback.dart';
 import 'package:observe/transformer.dart';
 
+import 'src/build/add_log_injector.dart';
 import 'src/build/build_filter.dart';
 import 'src/build/common.dart';
 import 'src/build/import_inliner.dart';
 import 'src/build/linter.dart';
+import 'src/build/log_combiner.dart';
 import 'src/build/polyfill_injector.dart';
 import 'src/build/script_compactor.dart';
 
@@ -78,10 +80,12 @@ List<List<Transformer>> createDeployPhases(
   // dart2js can analyze reachable code or entire libraries).
   var phases = options.lint ? [[new Linter(options)]] : [];
   return phases..addAll([
+    [new AddLogInjector(options)],
     [new ImportInliner(options)],
     [new ObservableTransformer()],
     [new ScriptCompactor(options, sdkDir: sdkDir)],
     [new PolyfillInjector(options)],
-    [new BuildFilter(options)]
+    [new BuildFilter(options)],
+    [new LogCombiner(options)],
   ]);
 }