Use Gson built from source. am: 7ddb89d3d8 am: a7762b08e3

Original change: https://android-review.googlesource.com/c/platform/external/caliper/+/2770178

Change-Id: I8f63e0da41ee46f91d5ee1e3ebc9686afe6704de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>