Use Gson built from source. am: 7ddb89d3d8

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

Change-Id: Icb663063c1bbe2205471df8d8ba6fe0e0575918d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>