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

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 2215 matching lines @@
   static Path absolutePath(Path path) {
     if (!path.isAbsolute) {
       return currentWorkingDirectory.join(path);
     }
     return path;
   }
 
   static String outputDir(Map configuration) {
     var result = '';
     var system = configuration['system'];
-    if (system == 'linux') {
+    if (system == 'linux' || system == 'android') {
       result = 'out/';
     } else if (system == 'macos') {
       result = 'xcodebuild/';
     } else if (system == 'windows') {
       result = 'build/';
+    } else {
+      throw new Exception('Unknown operating system: "$system"');
     }
     return result;
   }
 
   static List<String> standardOptions(Map configuration) {
     List args = ["--ignore-unrecognized-flags"];
     String compiler = configuration["compiler"];
     if (compiler == "dart2js") {
       args = ['--generate-code-with-compile-time-errors', '--test-mode'];
       if (configuration["checked"]) {
@@ skipping 76 matching lines @@
         break;
       case 'release':
         mode = 'Release';
         break;
       case 'product':
         mode = 'Product';
         break;
       default:
         throw 'Unrecognized mode configuration: ${configuration['mode']}';
     }
+    var os;
+    switch (configuration['system']) {
+      case 'android':
+        os = 'Android';
+        break;
+      case 'linux':
+      case 'macos':
+      case 'windows':
+        os = '';
+        break;
+      default:
+        throw 'Unrecognized operating system: ${configuration['system']}';
+    }
     var arch = configuration['arch'].toUpperCase();
-    var normal = '$mode$arch';
-    var cross = '${mode}X$arch';
+    var normal = '$mode$os$arch';
+    var cross = '$mode${os}X$arch';
     var outDir = outputDir(configuration);
     var normalDir = new Directory(new Path('$outDir$normal').toNativePath());
     var crossDir = new Directory(new Path('$outDir$cross').toNativePath());
     if (normalDir.existsSync() && crossDir.existsSync()) {
       throw "You can't have both $normalDir and $crossDir, we don't know which"
           " binary to use";
     }
     if (crossDir.existsSync()) {
       return cross;
     }
@@ skipping 86 matching lines @@
       for (var key in PATH_REPLACEMENTS.keys) {
         if (path.startsWith(key)) {
           path = path.replaceFirst(key, PATH_REPLACEMENTS[key]);
           break;
         }
       }
     }
     return path;
   }
 }