Add an extra to sharesheet's image edit intent

To allow the editor to customize the behavior for the sharesheet flow if
desired.

Test: Validate that EXTRA is received by editor.
Bug: 287621918
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f609ae4c5d04918b328ba12e4aa99ca8fecfde88)
Merged-In: Ia70cc645e85054fd73f77f989cb4267cdc524cd4
Change-Id: Ia70cc645e85054fd73f77f989cb4267cdc524cd4