VerboseLogger should just wrap the parent Logger (#10020)

This way, you can test things even with a VerboseLogger.

packages/flutter_tools/lib/src/base/logger.dart

@@ -180,12 +180,14 @@ class BufferLogger extends Logger {
 }
 
 class VerboseLogger extends Logger {
-  Stopwatch stopwatch = new Stopwatch();
-
-  VerboseLogger() {
+  VerboseLogger(this.parent) {
     stopwatch.start();
   }
 
+  final Logger parent;
+
+  Stopwatch stopwatch = new Stopwatch();
+
   @override
   bool get isVerbose => true;
 
@@ -221,7 +223,7 @@ class VerboseLogger extends Logger {
     stopwatch.reset();
 
     String prefix;
-    const int prefixWidth = 8;
+    const int prefixWidth = 12;
     if (millis == 0) {
       prefix = ''.padLeft(prefixWidth);
     } else {
@@ -235,13 +237,13 @@ class VerboseLogger extends Logger {
     final String indentMessage = message.replaceAll('\n', '\n$indent');
 
     if (type == _LogType.error) {
-      stderr.writeln(prefix + terminal.bolden(indentMessage));
+      parent.printError(prefix + terminal.bolden(indentMessage));
       if (stackTrace != null)
-        stderr.writeln(indent + stackTrace.toString().replaceAll('\n', '\n$indent'));
+        parent.printError(indent + stackTrace.toString().replaceAll('\n', '\n$indent'));
     } else if (type == _LogType.status) {
-      print(prefix + terminal.bolden(indentMessage));
+      parent.printStatus(prefix + terminal.bolden(indentMessage));
     } else {
-      print(prefix + indentMessage);
+      parent.printStatus(prefix + indentMessage);
     }
   }
 }

packages/flutter_tools/lib/src/runner/flutter_command_runner.dart

@@ -161,7 +161,7 @@ class FlutterCommandRunner extends CommandRunner<Null> {
     // Check for verbose.
     if (globalResults['verbose']) {
       // Override the logger.
-      context.setVariable(Logger, new VerboseLogger());
+      context.setVariable(Logger, new VerboseLogger(context[Logger]));
     }
 
     String recordTo = globalResults['record-to'];

packages/flutter_tools/test/src/base/logger_test.dart

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_tools/src/base/logger.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('AppContext', () {
+    test('error', () async {
+      final BufferLogger mockLogger = new BufferLogger();
+      final VerboseLogger verboseLogger = new VerboseLogger(mockLogger);
+
+      verboseLogger.printStatus('Hey Hey Hey Hey');
+      verboseLogger.printTrace('Oooh, I do I do I do');
+      verboseLogger.printError('Helpless!');
+
+      expect(mockLogger.statusText, matches(r'^\[     (?: {0,2}\+[0-9]{1,3} ms|       )\] Hey Hey Hey Hey\n'
+                                            r'\[     (?: {0,2}\+[0-9]{1,3} ms|       )\] Oooh, I do I do I do\n$'));
+      expect(mockLogger.traceText, '');
+      expect(mockLogger.errorText, matches(r'^\[     (?: {0,2}\+[0-9]{1,3} ms|       )\] Helpless!\n$'));
+    });
+  });
+}