Sync 'git cl presubmit' and 'tools/presubmit.py'
Sync 'git cl presubmit' and 'tools/presubmit.py'

More precisely, add CheckGeneratedRuntimeTests to checks performed by
'git cl presubmit'.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/352583005

git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@21970 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh