Add dart2snapshot compiler and dart_snapshotted runtime to test scripts

tools/testing/dart/runtime_configuration.dart

Index: tools/testing/dart/runtime_configuration.dart
diff --git a/tools/testing/dart/runtime_configuration.dart b/tools/testing/dart/runtime_configuration.dart
index 8596c6fe41015d05c3552da4acc153dfc4e9dd59..999a97caf6d9fd62f1c3009dbf3d9cb9d9a2d549 100644
--- a/tools/testing/dart/runtime_configuration.dart
+++ b/tools/testing/dart/runtime_configuration.dart
@@ -52,6 +52,9 @@ class RuntimeConfiguration {
       case 'vm':
         return new StandaloneDartRuntimeConfiguration();
 
+      case 'dart_snapshotted':
+        return new DartSnapshottedRuntimeConfiguration();
+
       case 'dart_precompiled':
         return new DartPrecompiledRuntimeConfiguration();
 
@@ -218,7 +221,7 @@ class StandaloneDartRuntimeConfiguration extends DartVmRuntimeConfiguration {
     if (script != null && type != 'application/dart') {
       throw "Dart VM cannot run files of type '$type'.";
     }
-    String executable = suite.configuration['noopt'] 
+    String executable = suite.configuration['noopt']
         ? suite.dartVmNooptBinaryFileName
         : suite.dartVmBinaryFileName;
     return <Command>[commandBuilder.getVmCommand(
@@ -226,6 +229,27 @@ class StandaloneDartRuntimeConfiguration extends DartVmRuntimeConfiguration {
   }
 }
 
+class DartSnapshottedRuntimeConfiguration extends DartVmRuntimeConfiguration {
+  List<Command> computeRuntimeCommands(
+      TestSuite suite,
+      CommandBuilder commandBuilder,
+      CommandArtifact artifact,
+      List<String> arguments,
+      Map<String, String> environmentOverrides) {
+    String script = artifact.filename;
+    String type = artifact.mimeType;
+    if (script != null && type != 'application/dart-snapshot') {
+      throw "dart_product cannot run files of type '$type'.";
+    }
+
+    var augmentedArgs = new List();
+    augmentedArgs.add("--run-full-snapshot=${artifact.filename}");
+    augmentedArgs.addAll(arguments);
+
+    return <Command>[commandBuilder.getVmCommand(
+          suite.dartVmBinaryFileName, augmentedArgs, environmentOverrides)];
+  }
+}
 
 class DartPrecompiledRuntimeConfiguration extends DartVmRuntimeConfiguration {
   List<Command> computeRuntimeCommands(