Add --build-directory option to test.py.

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 1485 matching lines @@
    * the main script using 'test_suite.dart' is not there, the main
    * script must set this to '.../dart/tools/test.dart'.
    */
   static String testScriptPath = new Options().script;
 
   /**
    * Creates a directory using a [relativePath] to an existing
    * [base] directory if that [relativePath] does not already exist.
    */
   static Directory mkdirRecursive(Path base, Path relativePath) {
+    if (relativePath.isAbsolute) {
+      base = new Path('/');
+    }
     Directory dir = new Directory.fromPath(base);
     Expect.isTrue(dir.existsSync(),
                   "Expected ${dir} to already exist");
     var segments = relativePath.segments();
     for (String segment in segments) {
       base = base.append(segment);
       dir = new Directory.fromPath(base);
       if (!dir.existsSync()) {
           dir.createSync();
       }
@@ skipping 22 matching lines @@
     // waterfall UI.
     return ".flaky.log";
   }
 
   static void ensureExists(String filename, Map configuration) {
     if (!configuration['list'] && !(new File(filename).existsSync())) {
       throw "Executable '$filename' does not exist";
     }
   }
 
-  static String outputDir(Map configuration) {
-    var result = '';
-    var system = configuration['system'];
-    if (system == 'linux') {
-      result = 'out/';
-    } else if (system == 'macos') {
-      result = 'xcodebuild/';
-    } else if (system == 'windows') {
-      result = 'build/';
-    }
-    return result;
-  }
-
   static Path dartDir() {
     File scriptFile = new File(testScriptPath);
     Path scriptPath = new Path.fromNative(scriptFile.fullPathSync());
     return scriptPath.directoryPath.directoryPath;
   }
 
   static List<String> standardOptions(Map configuration) {
     List args = ["--ignore-unrecognized-flags"];
     if (configuration["checked"]) {
       args.add('--enable_asserts');
@@ skipping 30 matching lines @@
     return BROWSERS.contains(runtime);
   }
 
   static bool isBrowserRuntime(String runtime) =>
       runtime == 'drt' || TestUtils.usesWebDriver(runtime);
 
   static bool isJsCommandLineRuntime(String runtime) =>
       const ['d8', 'jsshell'].contains(runtime);
 
   static String buildDir(Map configuration) {
+    if (configuration['build_directory'] != '') {
+      return configuration['build_directory'];
+    }
+    var outputDir = '';
+    var system = configuration['system'];
+    if (system == 'linux') {
+      outputDir = 'out/';
+    } else if (system == 'macos') {
+      outputDir = 'xcodebuild/';
+    } else if (system == 'windows') {
+      outputDir = 'build/';
+    }
     var mode = (configuration['mode'] == 'debug') ? 'Debug' : 'Release';
     var arch = configuration['arch'].toUpperCase();
-    return "${TestUtils.outputDir(configuration)}$mode$arch";
+    return "$outputDir$mode$arch";
   }
 }
 
 class SummaryReport {
   static int total = 0;
   static int skipped = 0;
   static int noCrash = 0;
   static int pass = 0;
   static int failOk = 0;
   static int fail = 0;
@@ skipping 41 matching lines @@
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
    }
 }