ART profiler

Add args to the installd commands for profiler usage.
Make installd create the profile files and allow apps
to write to them.

The profile files are in /data/dalvik-cache/profiles.  This
central location is needed due to permissions issues with
dex2oat reading from an app's data directory.  The solution
is to put the profile file in a directory owned by the
install user and make the file writeable by the shared group
id of for the app.  The app can read and write to these files
only in the profiles directory.  The 'system' user also needs
to be able to read the files in order to determine the amount
of change to the file over time.

Bug: 12877748
Change-Id: I9b8e59e3bd7df8a1bf60fa7ffd376a24ba0eb42f

Conflicts:
	cmds/installd/commands.c