Add a Framework unit test to mock gmail crash.

Previously when new Resources created, it may find an outdated
ResourcesImpl given the ResourcesKey and reuse it, which will
not have proper asset paths appended for shared library.
The issue has been fixed in ag/26665708. This CL is adding a
framework unit test to cover this case.

Bug: b/329915827
Test: Added new tests and verified affected tests pass.
Change-Id: I7772fde67ed72ce7bbbb2b24efd44823a1df2be1