test.py: Propagate the global --dartium option to the browser controller

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index 64a495f359a14c1743243c8e67f9af61a0b46114..3999cc1d4f56d5220c82489c80480b516ccc9694 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -1135,7 +1135,8 @@ class StandardTestSuite extends TestSuite {
               '--timeout=${configuration['timeout']}',
               '--out=$fullHtmlPath'];
           if (runtime == 'dartium') {
-            args.add('--executable=$dartiumFilename');
+            var dartiumLocation = Locations.getDartiumLocation(configuration);
+            args.add('--executable=$dartiumLocation');
           }
           if (subtestIndex != 0) {
             args.add('--force-refresh');
@@ -1308,17 +1309,6 @@ class StandardTestSuite extends TestSuite {
     return dartDir.append('client/tests/drt/content_shell').toNativePath();
   }
 
-  String get dartiumFilename {
-    if (configuration['dartium'] != '') {
-      return configuration['dartium'];
-    }
-    if (Platform.operatingSystem == 'macos') {
-      return dartDir.append('client/tests/dartium/Chromium.app/Contents/'
-                            'MacOS/Chromium').toNativePath();
-    }
-    return dartDir.append('client/tests/dartium/chrome').toNativePath();
-  }
-
   List<String> commonArgumentsFromFile(Path filePath, Map optionsFromFile) {
     List args = TestUtils.standardOptions(configuration);