Bug 1150512 - Add tools/wptserve to web-platform mozharness script; r=jgraham

--HG--
extra : commitid : GxCB4jDZJ81
extra : rebase_source : 542e33e119d97fe295f7a3ca56a07f7a29cb00a0
extra : histedit_source : ddc90426cd3d4cbc736bc8b9ea80313c65e4275e

testing/mozharness/scripts/web_platform_tests.py

@@ -169,6 +169,7 @@ class WebPlatformTest(TestingMixin, MercurialScript, BlobUploadMixin):
                                "config/*",
                                "mozbase/*",
                                "marionette/*",
+                               "tools/wptserve/*",
                                "web-platform/*"],
             suite_categories=["web-platform"])