Webengine tests fails because of timeout during qt5.git integration in '5.10'

agent:2017/09/04 08:50:18 build.go:570: agent:2017/09/04 08:50:18 build.go:401: Executing instruction 46 of 74 - SetExecutionPhaseName agent:2017/09/04 08:50:18 build.go:570: agent:2017/09/04 08:50:18 build.go:401: Executing instruction 47 of 74 - RunQtUnitTest agent:2017/09/04 08:50:18 build.go:279: [make check -j1] 900 900 /Users/qt/work/qt/qtwebengine/tests/auto/widgets/qwebengineaccessibility/target_wrapper.sh ./tst_qwebengineaccessibility -o /Users/qt/work/testresults/tests/auto/widgets/qwebengineaccessibility992613605,xml -o -,txt agent:2017/09/04 09:05:18 build.go:218: Killed process after timeout (total time) agent:2017/09/04 09:05:18 build.go:155: Error reading from stdout/err: Timeout after 15m0s: Maximum duration reached agent:2017/09/04 09:05:18 agent.go:76: ERROR building: Timeout after 15m0s: Maximum duration reached

build log: http://10.212.3.36:8080/coin/api/results/qt/qtwebengine/283251893c9afe456f1d3198de80bf099dd6afad/MacOSOSX_10_11x86_64MacOSOSX_10_11x86_64Clangqtci-osx-10.11-x86_64-3-cf3fdaDeveloperBuild_Release_QtNamespace_NoPch/08a7cdc8200bfad24aeeb2fea3ba8f1b767f48b6/test_1504504362/testlog.txt.gz

Details: https://testresults.qt.io/coin/integration/qt/qt5/tasks/1504500549

Tested changes (refs/builds/qtci/5.10/1504500543):
https://codereview.qt-project.org/#/q/e38a07f4e133cc5571b6649fc378301f971d3358,n,z Update submodules on '5.10' in qt5