Add "run_testserver --sync-test" for easy chromiumsync_test.py launching.

net/tools/testserver/run_testserver.cc

Index: net/tools/testserver/run_testserver.cc
diff --git a/net/tools/testserver/run_testserver.cc b/net/tools/testserver/run_testserver.cc
index 51b9aac0c69c8d3b0ff993f75b9e702eaf4ec9de..b94c98689ea32e23c01f58ad7d5499467c22ac14 100644
--- a/net/tools/testserver/run_testserver.cc
+++ b/net/tools/testserver/run_testserver.cc
@@ -51,6 +51,8 @@ int main(int argc, const char* argv[]) {
     server_type = net::TestServer::TYPE_FTP;
   } else if (command_line->HasSwitch("sync")) {
     server_type = net::TestServer::TYPE_SYNC;
+  } else if (command_line->HasSwitch("sync-test")) {
+    return net::TestServer::RunSyncTest() ? 0 : -1;
   }
 
   net::TestServer::HTTPSOptions https_options;