Reland [swarming] Isolate v8 testing.

test/default.isolate

Index: test/default.isolate
diff --git a/src/d8.isolate b/test/default.isolate
similarity index 50%
copy from src/d8.isolate
copy to test/default.isolate
index 1c9bd9e35ca9df94ff3473eac29c06377a284339..d3d0c1430e982937ed43ae37fe4a02f08aeb017b 100644
--- a/src/d8.isolate
+++ b/test/default.isolate
@@ -2,15 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
-  'variables': {
-    'command': [
-      '<(PRODUCT_DIR)/d8<(EXECUTABLE_SUFFIX)',
-    ],
-    'files': [
-      '<(PRODUCT_DIR)/d8<(EXECUTABLE_SUFFIX)',
-    ],
-  },
   'includes': [
-    'base.isolate',
+    'cctest/cctest.isolate',
+    'intl/intl.isolate',
+    'message/message.isolate',
+    'mjsunit/mjsunit.isolate',
+    'preparser/preparser.isolate',
   ],
 }