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This CL adds the ability to specify a script in an android_aar_prebuilt
rule that can modify prebuilt jar files, and adds a script to change
Fragment.getActivity() and Fragment.requireActivity() to return an
Activity instead of a FragmentActivity.

This is the first CL in a chain that will allow us to remove the fake
activity we create when embedding Fragments that cross classloader
boundaries.

Bug: 1123216
Change-Id: I4b9d3ca5f9c3a4d86e08d64f49d601c08fca9a70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432413Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823582}