Fix passing of shard options in test wrapper.

tools/test-wrapper-gypbuild.py

Index: tools/test-wrapper-gypbuild.py
diff --git a/tools/test-wrapper-gypbuild.py b/tools/test-wrapper-gypbuild.py
index 465ca88c3d98bf46fe6211119625d18b380795c1..fda4105a985f11b4bad4d26991d982f8c6de5fa3 100755
--- a/tools/test-wrapper-gypbuild.py
+++ b/tools/test-wrapper-gypbuild.py
@@ -197,9 +197,9 @@ def PassOnOptions(options):
   if options.crankshaft:
     result += ['--crankshaft']
   if options.shard_count != 1:
-    result += ['--shard_count=%s' % options.shard_count]
+    result += ['--shard-count=%s' % options.shard_count]
   if options.shard_run != 1:
-    result += ['--shard_run=%s' % options.shard_run]
+    result += ['--shard-run=%s' % options.shard_run]
   if options.noprof:
     result += ['--noprof']
   return result