Telemetry / Android: uses alternative command line for "user" builds.

When running in a "user" build device, chrome will now support reading the
command line file from an alternative directory.

BUG=162410
TEST=run octane on a "user" build.

Review URL: https://codereview.chromium.org/104563005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239694 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239694