Download test data for v8 simd tests.

scripts/slave/recipe_modules/v8/resources/v8testing.py

Index: scripts/slave/recipe_modules/v8/resources/v8testing.py
diff --git a/scripts/slave/recipe_modules/v8/resources/v8testing.py b/scripts/slave/recipe_modules/v8/resources/v8testing.py
index a1b23d0c3fe38d1d85a23bca2f4d364dcaae3c9e..5d7485750ba73435cd882abfddd126e994cf55aa 100755
--- a/scripts/slave/recipe_modules/v8/resources/v8testing.py
+++ b/scripts/slave/recipe_modules/v8/resources/v8testing.py
@@ -140,6 +140,10 @@ def main():
     cmd.extend(['--download-data'])
   if 'test262-es6' in options.testname:
     cmd.extend(['--download-data'])
+  if 'simdjs' in options.testname:
+    cmd.extend(['--download-data'])
+  if 'simdjs/shell_test_runner' in options.testname:
+    cmd.extend(['--download-data'])
   if 'mozilla' in options.testname:
     # Mozilla tests requires a number of tests to timeout, set it a bit lower.
     if options.arch in ('arm', 'mipsel'):