Switch to source-built GSON. am: d92bdaa3fc

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

Change-Id: Ibe88e0bcb7fc49cf853c0f7c7a7f6afe1639cfc5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>