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This allows screenshots to be shared by looping back to the share sheet.
A new JNI call to make a Uri from an arbitrary bitmap is also included.

Bug: 1093372
Change-Id: I444634f5a19ac5a9b3b30c961127de7fe5cda72e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2243496
Commit-Queue: Jeffrey Cohen <jeffreycohen@chromium.org>
Reviewed-by: Tanya Gupta <tgupta@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780501}