[swarming] Add isolate configs for d8 on linux.

src/d8.isolate

Index: src/d8.isolate
diff --git a/src/d8.isolate b/src/d8.isolate
new file mode 100644
index 0000000000000000000000000000000000000000..1c9bd9e35ca9df94ff3473eac29c06377a284339
--- /dev/null
+++ b/src/d8.isolate
@@ -0,0 +1,16 @@
+# Copyright 2015 the V8 project authors. All rights reserved.
+# 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',
+  ],
+}