Switch to source-built GSON. am: d92bdaa3fc am: dbeb64e2d8

Original change: https://android-review.googlesource.com/c/platform/tools/test/graphicsbenchmark/+/2199695

Change-Id: I42c03d5a68427d85412f97a3ffc6ea19b6ac1691
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>