[test] add --no-harness option to debugger tests.

Review-Url: https://codereview.chromium.org/2831083003
Cr-Commit-Position: refs/heads/master@{#44774}

test/debugger/testcfg.py

@@ -51,6 +51,7 @@ class DebuggerTestSuite(testsuite.TestSuite):
         break
 
     files = []
+    if not context.no_harness and not NO_HARNESS_PATTERN.search(source):
       files.append(os.path.normpath(os.path.join(self.root, "..", "mjsunit", "mjsunit.js")))
     files.append(os.path.join(self.root, "test-api.js"))
     files.extend([ os.path.normpath(os.path.join(self.root, '..', '..', f))