This makes it easier to debug what is being blocked by the sandbox.
gpu and renderer processes were already covered, this adds propagation
for utility and worker processes, and nacl, pepper and npapi plugin
processes. The points to handle were discovered by looking for
kNoSandbox cases, which is why NPAPI is on the list, even though we do
not sandbox it on OSX at this time.
BUG=152327
TEST=--enable-sandbox-logging and look for messages from subprocesses in /var/log/syslog.log
Review URL: https://chromiumcodereview.appspot.com/10978037
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@159956 0039d316-1c4b-4281-b951-d872f2087c98
