Add --source-path flag to AAPT2 compile

This added flag uses a given value to replace the default absolute resource
file path in the compiled resource file. This allows for relative file
paths to be used instead of absolute file paths.

Test: Compile_test.cpp
Bug: 159611599
Change-Id: I5f1c99cf40e5d31fc54cda819c91640285986d2a
3 files changed