Show the nearby chip for images and files too.

This revealed that we weren't initializing the nearby intent
from the original intent, so that's fixed too. This should
ensure that flags and extras from the original intent make
their way to the available and installed nearby component.

Change-Id: I0cac4b1ac63d95b0f0d2ef8d2e614674253c7cb4
Test: Share (an image and a non-image) from DocumentsUI
Fixes: 155487375
Fixes: 155676993
Merged-In: If0c0b754a066b0ec439a866de3eae84caca7b793