Adds logging of cached apps on android

Crashes on android don't show symbols. We get something like:
F/chromium( 3092): #24 0x9f83fb1d /data/data/org.chromium.mojo_shell_apk/cache/.org.chromium.Chromium.GGB6US+0x0003eb1d
The file here is a temp file. This is useless as we don't know what
that temp file corresponded to. This adds logging of what the temp file
corresponds to so that we can map it back to the .so.

I would have liked to use VLOG and explicitly enable logging for this
function when we care about it, but I couldn't get it to work. That
may be because of initialization ordering.

BUG=none
TEST=none
R=davemoore@chromium.org

Review URL: https://codereview.chromium.org/796063002