Add temporary directory for dartc compilation of tests.

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 8808912286dafdce739ef42d2890d6888d1914d4..41077d2bcf7efd4305f43d94909190f91176c922 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -406,9 +406,11 @@ class ProcessQueue {
   int _maxProcesses;
   bool _verbose;
   bool _listTests;
+  bool _keepGeneratedTests;
   Function _enqueueMoreWork;
   Queue<TestCase> _tests;
   ProgressIndicator _progress;
+  String _temporaryDirectory;
   // For dartc batch processing we keep a list of batch processes.
   List<DartcBatchRunnerProcess> _batchProcesses;
   // Cache information about test cases per test suite. For multiple
@@ -421,22 +423,22 @@ class ProcessQueue {
                Date startTime,
                bool printTiming,
                Function this._enqueueMoreWork,
-               [bool verbose = false,
-                bool listTests = false])
+               [bool this._verbose = false,
+                bool this._listTests = false,
+                bool this._keepGeneratedTests = false])
       : _tests = new Queue<TestCase>(),
         _progress = new ProgressIndicator.fromName(progress,
                                                    startTime,
                                                    printTiming),
         _batchProcesses = new List<DartcBatchRunnerProcess>(),
-        _testCache = new Map<String, List<TestInformation>>(),
-        _verbose = verbose,
-        _listTests = listTests {
+        _testCache = new Map<String, List<TestInformation>>() {
     if (!_enqueueMoreWork(this)) _progress.allDone();
   }
 
   void addTestSuite(TestSuite testSuite) {
     _activeTestListers++;
-    testSuite.forEachTest(_runTest, _testCache, _testListerDone);
+    testSuite.forEachTest(_runTest, _testCache, globalTemporaryDirectory,
+                          _testListerDone);
   }
 
   void _testListerDone() {
@@ -444,6 +446,20 @@ class ProcessQueue {
     _checkDone();
   }
 
+  String globalTemporaryDirectory() {
+    if (_temporaryDirectory != null) return _temporaryDirectory;
+
+    if (new Platform().operatingSystem() == 'windows') {
+      throw new Exception(
+          'Test suite requires temporary directory. Not supported on Windows.');
+    }
+    var tempDir = new Directory('');
+    tempDir.createTempSync();
+    _temporaryDirectory = tempDir.path;
+    return _temporaryDirectory;
+  }
+
+
   void _checkDone() {
     // When there are no more active test listers ask for more work
     // from process queue users.
@@ -451,7 +467,22 @@ class ProcessQueue {
       _progress.allTestsKnown();
       if (_tests.isEmpty() && _numProcesses == 0) {
         _terminateDartcBatchRunners();
-        _progress.allDone();
+        if (_keepGeneratedTests || _temporaryDirectory == null) {
+          _progress.allDone();
+        } else if (!_temporaryDirectory.startsWith('/tmp/') ||
+                   _temporaryDirectory.contains('/../')) {
+          // Let's be extra careful, since rm -rf is so dangerous.
+          print('Temporary directory $_temporaryDirectory unsafe to delete!');
+          _progress.allDone();
+        } else {
+          // TODO(dart:1211): Use delete(recursive=true) in Dart when it is
+          // implemented, and add Windows support.
+          var deletion =
+              new Process.start('/bin/rm', ['-rf', _temporaryDirectory]);
+          deletion.startHandler = (){
+            _progress.allDone();
+          };
+        }
       }
     }
   }