Refactor roll_aosp.sh roll_aosp.sh can now generate an Android.bp file without having to perform a roll. This facilitates on demand generation of Android.bp. Provide an option to enable API traces with "--enableApiTrace" flag. Usage - # Generates Android.bp and perform a roll ./scripts/roll_aosp.sh # Generates Android.bp ./scripts/roll_aosp.sh --genAndroidBp # Generates Android.bp with API tracing enabled ./scripts/roll_aosp.sh --genAndroidBp --enableApiTrace Bug: angleproject:5774 Change-Id: I3a2bd505f5d75d6d5fc331d61fa9517d6042db70 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2774758 Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Mohan Maiya <m.maiya@samsung.com>