enable batch mode for dartdevc tests, also fix status so ddc bots pass

pkg/dev_compiler/lib/src/compiler/command.dart

Index: pkg/dev_compiler/lib/src/compiler/command.dart
diff --git a/pkg/dev_compiler/lib/src/compiler/command.dart b/pkg/dev_compiler/lib/src/compiler/command.dart
index dfce39705c426951ebaa9a5bf0e1d53685a5c4fa..854957131594b463c098fbbd037b1ff2b56afaa7 100644
--- a/pkg/dev_compiler/lib/src/compiler/command.dart
+++ b/pkg/dev_compiler/lib/src/compiler/command.dart
@@ -281,3 +281,38 @@ class ForceCompileErrorException extends CompileErrorException {
   toString() =>
       '\nForce-compilation not successful. Please check static errors.';
 }
+
+// TODO(jmesserly): fix this function in analyzer
+List<String> filterUnknownArguments(List<String> args, ArgParser parser) {
+  Set<String> knownOptions = new Set<String>();
+  Set<String> knownAbbreviations = new Set<String>();
+  parser.options.forEach((String name, option) {
+    knownOptions.add(name);
+    String abbreviation = option.abbreviation;
+    if (abbreviation != null) {
+      knownAbbreviations.add(abbreviation);
+    }
+  });
+  List<String> filtered = <String>[];
+  for (int i = 0; i < args.length; i++) {
+    String argument = args[i];
+    if (argument.startsWith('--') && argument.length > 2) {
+      int equalsOffset = argument.lastIndexOf('=');
+      int end = equalsOffset < 0 ? argument.length : equalsOffset;
+      if (knownOptions.contains(argument.substring(2, end))) {
+        filtered.add(argument);
+      }
+    } else if (argument.startsWith('-') && argument.length > 1) {
+      // TODO(jmesserly): fix this line in analyzer
+      // It was discarding abbreviations such as -Da=b
+      // Abbreviations must be 1-character (this is enforced by ArgParser),
+      // so we don't need to use `optionName`
+      if (knownAbbreviations.contains(argument[1])) {
+        filtered.add(argument);
+      }
+    } else {
+      filtered.add(argument);
+    }
+  }
+  return filtered;
+}