Outline of how to factor out compiler and runtime specifics.

dart/tools/testing/dart/compiler_configuration.dart

Index: dart/tools/testing/dart/compiler_configuration.dart
diff --git a/dart/tools/testing/dart/compiler_configuration.dart b/dart/tools/testing/dart/compiler_configuration.dart
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+// Copyright (c) 2014, 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.
+
+library compiler_configuration;
+
+abstract class CompilerConfiguration {
+  // TODO(ahe): Remove this constructor and move the switch to
+  // test_options.dart.  We probably want to store an instance of
+  // [CompilerConfiguration] in [configuration] there.
+  factory CompilerConfiguration(Map configuration) {
+    String compiler = configuration['compiler'];
+    switch (compiler) {
+      case 'dartanalyzer':
+      case 'dart2analyzer':
+        return new AnalyzerCompilerConfiguration();
+      case 'dart2js':
+        return new Dart2jsCompilerConfiguration();
+      case 'dart2dart':
+        return new Dart2dartCompilerConfiguration();
+      case 'none':
+        return new NoneCompilerConfiguration();
+      default:
+        throw "Unknown compiler '$compiler'";
+    }
+  }
+
+  CompilerConfiguration._subclass();
+
+  /// Return a multiplier used to give tests longer time to run.
+  int computeTimeoutMultiplier({
+      bool isDebug: false,
+      bool isChecked: false,
+      bool isHostChecked: false}) {
+    return 1;
+  }
+}
+
+/// The "none" compiler.
+class NoneCompilerConfiguration extends CompilerConfiguration {
+  NoneCompilerConfiguration()
+      : super._subclass();
+}
+
+/// Common configuration for dart2js-based tools, such as, dart2js and
+/// dart2dart.
+class Dart2xCompilerConfiguration extends CompilerConfiguration {
+  Dart2xCompilerConfiguration()
+      : super._subclass();
+}
+
+/// Configuration for dart2js compiler.
+class Dart2jsCompilerConfiguration extends Dart2xCompilerConfiguration {
+  int computeTimeoutMultiplier({
+      bool isDebug: false,
+      bool isChecked: false,
+      bool isHostChecked: false}) {
+    int multiplier = 1;
+    if (isDebug) multiplier *= 4;
+    if (isChecked) multiplier *= 2;
+    if (isHostChecked) multiplier *= 16;
+    return multiplier;
+  }
+}
+
+/// Configuration for dart2dart compiler.
+class Dart2dartCompilerConfiguration extends Dart2xCompilerConfiguration {
+}
+
+/// Common configuration for analyzer-based tools, such as, dartanalyzer.
+class AnalyzerCompilerConfiguration extends CompilerConfiguration {
+  AnalyzerCompilerConfiguration()
+      : super._subclass();
+
+  int computeTimeoutMultiplier({
+      bool isDebug: false,
+      bool isChecked: false,
+      bool isHostChecked: false}) {
+    return 4;
+  }
+}