Add test harness option for app snapshots with unoptimized code.

tools/testing/dart/compiler_configuration.dart

Index: tools/testing/dart/compiler_configuration.dart
diff --git a/tools/testing/dart/compiler_configuration.dart b/tools/testing/dart/compiler_configuration.dart
index 5781e837cd6ca5cd898af482519cf481fb39cd85..398986a50f1c4e566d60c9ba3997acdd08c00eac 100644
--- a/tools/testing/dart/compiler_configuration.dart
+++ b/tools/testing/dart/compiler_configuration.dart
@@ -74,6 +74,9 @@ abstract class CompilerConfiguration {
       case 'dart2app':
         return new Dart2AppSnapshotCompilerConfiguration(
             isDebug: isDebug, isChecked: isChecked);
+      case 'dart2appjit':
+        return new Dart2AppJitSnapshotCompilerConfiguration(
+            isDebug: isDebug, isChecked: isChecked, useBlobs: useBlobs);
       case 'precompiler':
         return new PrecompilerCompilerConfiguration(
             isDebug: isDebug,
@@ -552,6 +555,37 @@ class Dart2AppSnapshotCompilerConfiguration extends CompilerConfiguration {
   }
 }
 
+class Dart2AppJitSnapshotCompilerConfiguration extends Dart2AppSnapshotCompilerConfiguration {
+  final bool useBlobs;
+  Dart2AppJitSnapshotCompilerConfiguration({bool isDebug, bool isChecked, bool useBlobs})
+      : super(isDebug: isDebug, isChecked: isChecked), this.useBlobs = useBlobs;
+
+  CompilationCommand computeCompilationCommand(
+      String tempDir,
+      String buildDir,
+      CommandBuilder commandBuilder,
+      List arguments,
+      Map<String, String> environmentOverrides) {
+    var exec = "$buildDir/dart";
+    var args = new List();
+    args.add("--snapshot=$tempDir");
+    args.add("--snapshot-kind=app-jit-after-run");
+    if (useBlobs) {
+      args.add("--use-blobs");
+    }
+    args.addAll(arguments);
+
+    return commandBuilder.getCompilationCommand(
+        'dart2snapshot',
+        tempDir,
+        !useSdk,
+        bootstrapDependencies(buildDir),
+        exec,
+        args,
+        environmentOverrides);
+  }
+}
+
 class AnalyzerCompilerConfiguration extends CompilerConfiguration {
   AnalyzerCompilerConfiguration(
       {bool isDebug, bool isChecked, bool isHostChecked, bool useSdk})