Add debugging for issue #23190084: [APPComm][Dev Test] {Unable to share photo...

...from Camera360 to Hangouts }

In the short URI toString, include a small summary of the ClipData (instead
of just saying it has a clip data).  This makes it a lot easier to understand
what is happening when you look at the log of activity starts.

Also separate out the activity manager dump of URI permission grants from
its dump of providers, so it is easy to just look at that state.

Change-Id: I68093d9f279944e1aa9a29347075f237f4f55ed3