Merge "Add toString() to HardwareBuffer" am: 63a49903a8

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2618318

Change-Id: Iff6c185b517fda0de3826ab09b4a9e5ff140d32b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>