Support --batch for dart2js in testing script.

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
diff --git a/tools/testing/dart/test_runner.dart b/tools/testing/dart/test_runner.dart
index 300fbeea64a564c7b2d69d35bd5571c09dc3edb1..bbddef2f6ac3f1057573834553eec47d1ea828eb 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -1955,7 +1955,7 @@ class BatchRunnerProcess {
         // This is a unix shell script, no windows equivalent available
         'run_executable' : 'editor/tools/analyzer',
         'run_arguments' : ['--batch'],
-    },
+      },
   };
 
   Completer<CommandOutput> _completer;
@@ -1978,7 +1978,9 @@ class BatchRunnerProcess {
   DateTime _startTime;
   Timer _timer;
 
-  BatchRunnerProcess();
+  final String _executable;
+
+  BatchRunnerProcess(this._executable);
 
   Future<CommandOutput> runCommand(String runnerType, ProcessCommand command,
                                    int timeout, List<String> arguments) {
@@ -2091,8 +2093,15 @@ class BatchRunnerProcess {
   }
 
   _startProcess(callback) {
-    var executable = batchRunnerTypes[_runnerType]['run_executable'];
-    var arguments = batchRunnerTypes[_runnerType]['run_arguments'];
+    var executable;
+    var arguments;
+    if (_runnerType == 'dart2js') {
+      executable = _executable;
+      arguments = ['--batch'];
+    } else {
+      executable = batchRunnerTypes[_runnerType]['run_executable'];
+      arguments = batchRunnerTypes[_runnerType]['run_arguments'];
+    }
     var environment = new Map.from(io.Platform.environment);
     if (_processEnvironmentOverrides != null) {
       for (var key in _processEnvironmentOverrides.keys) {
@@ -2530,8 +2539,11 @@ class CommandExecutorImpl implements CommandExecutor {
 
     if (command is BrowserTestCommand) {
       return _startBrowserControllerTest(command, timeout);
+    } else if (command is CompilationCommand && batchMode) {
+      return _getBatchRunner(command.executable, "dart2js")
+          .runCommand("dart2js", command, timeout, command.arguments);
     } else if (command is AnalysisCommand && batchMode) {
-      return _getBatchRunner(command.flavor)
+      return _getBatchRunner(null, command.flavor)
           .runCommand(command.flavor, command, timeout, command.arguments);
     } else if (command is ScriptCommand) {
       return command.run();
@@ -2540,13 +2552,13 @@ class CommandExecutorImpl implements CommandExecutor {
     }
   }
 
-  BatchRunnerProcess _getBatchRunner(String identifier) {
+  BatchRunnerProcess _getBatchRunner(String executable, String identifier) {
     // Start batch processes if needed
     var runners = _batchProcesses[identifier];
     if (runners == null) {
       runners = new List<BatchRunnerProcess>(maxProcesses);
       for (int i = 0; i < maxProcesses; i++) {
-        runners[i] = new BatchRunnerProcess();
+        runners[i] = new BatchRunnerProcess(executable);
       }
       _batchProcesses[identifier] = runners;
     }