Always run browser tests with -j1. This should unbreak the PNaCl toolchain builders.

tools/llvm/utman-test.sh

 #!/bin/bash
 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 #@                 Untrusted Toolchain Test Helper
 #@-------------------------------------------------------------------
 #@ It MUST be run from the native_client/ directory.
 #@
 #@ The env variables: UTMAN_CONCURRENCY, UTMAN_BUILDBOT, UTMAN_DEBUG
@@ skipping 210 matching lines @@
   test-scons-sbtc-common x86-64 "$@"
 }
 
 #@ --- Displayless chrome browser tests (for bots / interruption-free testing).
 #@ --- To run a browser test with a display, use plain test-${arch} instead.
 
 # These call out to the other buildbot test script. We should have
 # buildbot_toolchain_arm_untrusted.sh use the same tests directly.
 # TODO(jvoung): remove these when unified.
 
+# scons browser-tests are currently broken with concurrency, so use -j1
+# BUG= http://code.google.com/p/nativeclient/issues/detail?id=2019
+
 #@ test-arm-browser      - run arm browser tests via pnacl toolchain.
 test-arm-browser() {
   ${OTHER_TEST_SCRIPT} browser-tests "arm" \
-    "--mode=opt-host,nacl -j${UTMAN_CONCURRENCY}"
+    "--mode=opt-host,nacl -j1"
 }
 
 #@ test-x86-32-browser   - run x86-32 browser tests via pnacl toolchain.
 test-x86-32-browser() {
   ${OTHER_TEST_SCRIPT} browser-tests "x86-32" \
-    "--mode=opt-host,nacl -j${UTMAN_CONCURRENCY}"
+    "--mode=opt-host,nacl -j1"
 }
 
 #@ test-x86-64-browser   - run all x86-64 browser tests via pnacl toolchain.
 test-x86-64-browser() {
   ${OTHER_TEST_SCRIPT} browser-tests "x86-64" \
-    "--mode=opt-host,nacl -j${UTMAN_CONCURRENCY}"
+    "--mode=opt-host,nacl -j1"
 }
 
 #@ test-all              - run arm, x86-32, and x86-64 tests. (all should pass)
 test-all() {
   if [ $# -ne 0 ]; then
     echo "test-all does not take any arguments"
     exit -1
   fi
 
   ${OTHER_TEST_SCRIPT} mode-test-all-fast ${UTMAN_CONCURRENCY}
@@ skipping 105 matching lines @@
 [ $# = 0 ] && set -- help  # Avoid reference to undefined $1.
 if [ "$(type -t $1)" != "function" ]; then
   #Usage
   echo "ERROR: unknown function '$1'." >&2
   echo "For help, try:"
   echo "    $0 help"
   exit 1
 fi
 
 "$@"