--origin tells mojo_shell to map all mojo: urls
to to a new base-url instead of the build directory.
This makes skydb's mojo_shell *always* use the network
loading path, which is what Android mojo_shell does
and is more like how mojo_shell will eventually be
used.
I also fixed the disk-space leak in the
dynamic_application_loader's NetworkLoader path
by having it immediately unlink the /tmp copy
of the library after dlopen.
In order to keep pprof working I had to teach the
dynamic_application_loader to write out a map of
/tmp/file -> url mappings so that we can fix
the pprof file afterwords.
This will "break" skydb --gdb on linux in exactly
as much as it is already broken on Android, but
I'm working on a build-id based solution for both
so that gdb knows how to find symbols for
non-existant randomly named /tmp libraries.
R=abarth@chromium.org, viettrungluu@chromium.org
BUG=450696
Review URL: https://codereview.chromium.org/829183005
8be2c7c168