Merge "printflags: improve protobuf decode error message" into main am: dcbe6097

Original change: https://android-review.googlesource.com/c/platform/build/+/2779288



Change-Id: I54f8e61be8e9cbc89587c1175db1697acd119dc0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>