Initial support to test.dart for running precompiler tests on android devices

tools/testing/dart/test_configurations.dart

Index: tools/testing/dart/test_configurations.dart
diff --git a/tools/testing/dart/test_configurations.dart b/tools/testing/dart/test_configurations.dart
index ff482734681a67899028ad8e21647f1e3916090e..0acb44c468c466ff7e498a7ff4a38b99ccbde632 100644
--- a/tools/testing/dart/test_configurations.dart
+++ b/tools/testing/dart/test_configurations.dart
@@ -8,6 +8,7 @@ import "dart:async";
 import 'dart:io';
 import "dart:math" as math;
 
+import 'android.dart';
 import "browser_controller.dart";
 import "co19_test_config.dart";
 import "http_server.dart";
@@ -49,7 +50,7 @@ final TEST_SUITE_DIRECTORIES = [
   new Path('utils/tests/peg'),
 ];
 
-void testConfigurations(List<Map> configurations) {
+Future testConfigurations(List<Map> configurations) async {
   var startTime = new DateTime.now();
   // Extract global options from first configuration.
   var firstConf = configurations[0];
@@ -281,7 +282,17 @@ void testConfigurations(List<Map> configurations) {
     eventListener.add(new ExitCodeSetter());
   }
 
-  void startProcessQueue() {
+  Future startProcessQueue() async {
+    AdbDevicePool pool;
+
+    bool needsAdbDevicePool = configurations.any((Map conf) {
+      return conf['runtime'] == 'dart_precompiled' &&
+             conf['system'] == 'android';
+    });
+    if (needsAdbDevicePool) {
+      pool = await AdbDevicePool.create();
+    }
+
     // [firstConf] is needed here, since the ProcessQueue needs to know the
     // settings of 'noBatch' and 'local_ip'
     new ProcessQueue(
@@ -294,13 +305,14 @@ void testConfigurations(List<Map> configurations) {
         allTestsFinished,
         verbose,
         recordingPath,
-        recordingOutputPath);
+        recordingOutputPath,
+        pool);
   }
 
   // Start all the HTTP servers required before starting the process queue.
   if (serverFutures.isEmpty) {
-    startProcessQueue();
+    await startProcessQueue();
   } else {
-    Future.wait(serverFutures).then((_) => startProcessQueue());
+    await Future.wait(serverFutures).then((_) => startProcessQueue());
   }
 }