Make test.dart strong mode clean!

tools/testing/dart/compiler_configuration.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library compiler_configuration;
 
 import 'dart:io' show Platform;
 
 import 'runtime_configuration.dart' show RuntimeConfiguration;
 import 'runtime_configuration.dart' show DartPrecompiledAdbRuntimeConfiguration;
@@ skipping 143 matching lines @@
 
   // TODO(ahe): Remove this.
   bool get isCsp => false;
 
   List<Uri> bootstrapDependencies(String buildDir) => const <Uri>[];
 
   CommandArtifact computeCompilationArtifact(
       String buildDir,
       String tempDir,
       CommandBuilder commandBuilder,
-      List arguments,
+      List<String> arguments,
       Map<String, String> environmentOverrides) {
     return new CommandArtifact([], null, null);
   }
 
   List<String> computeCompilerArguments(vmOptions, sharedOptions, args) {
     return new List<String>()..addAll(sharedOptions)..addAll(args);
   }
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
@@ skipping 74 matching lines @@
 
   @override
   String computeCompilerPath(String buildDir) {
     return 'tools/dartk_wrappers/dartk$executableScriptSuffix';
   }
 
   CompilationCommand computeCompilationCommand(
       String outputFileName,
       String buildDir,
       CommandBuilder commandBuilder,
-      List arguments,
+      List<String> arguments,
       Map<String, String> environmentOverrides) {
     Iterable<String> extraArguments = [
       '--sdk',
       '$buildDir/patched_sdk',
       '--link',
       '--target=vm',
       treeShake ? '--tree-shake' : null,
       strong ? '--strong' : null,
       verify ? '--verify-ir' : null,
       '--out',
       outputFileName
     ].where((x) => x != null);
     return commandBuilder.getKernelCompilationCommand(
         'dartk',
         outputFileName,
         true,
         bootstrapDependencies(buildDir),
         computeCompilerPath(buildDir),
-        []..addAll(arguments)..addAll(extraArguments),
+        <String>[]..addAll(arguments)..addAll(extraArguments),
         environmentOverrides);
   }
 
   CommandArtifact computeCompilationArtifact(
       String buildDir,
       String tempDir,
       CommandBuilder commandBuilder,
-      List arguments,
+      List<String> arguments,
       Map<String, String> environmentOverrides) {
     return new CommandArtifact(<Command>[
       this.computeCompilationCommand('$tempDir/out.dill', buildDir,
           CommandBuilder.instance, arguments, environmentOverrides)
     ], '$tempDir/out.dill', 'application/dart');
   }
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
       String buildDir,
@@ skipping 668 matching lines @@
       RuntimeConfiguration runtimeConfiguration,
       String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
       List<String> originalArguments,
       CommandArtifact artifact) {
     return <String>[];
   }
 }