Filed by sheriff-o-matic@appspot.gserviceaccount.com on behalf of mgiuca@google.com

Started failing around 2:00 UTC (June 5) (r564324 .. r564340), on the following builders:

generate_build_files failing on multiple builders

Builders failed on: 
- Android: 
  https://ci.chromium.org/buildbot/chromium/Android
- Android Release (Nexus 5X): 
  https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Android%20Release%20%28Nexus%205X%29
- Android CFI: 
  https://ci.chromium.org/buildbot/chromium.memory/Android%20CFI
- Android Builder: 
  https://ci.chromium.org/buildbot/chromium.webkit/Android%20Builder

All with the same failure:

/b/swarming/w/ir/cache/builder/src/buildtools/linux64/gn gen //out/Release --check --runtime-deps-list-file=/b/swarming/w/ir/cache/builder/src/out/Release/runtime_deps
  -> returned 1
ERROR at //build/config/android/rules.gni:3208:32: Could not read file.
    _scanned_files = read_file(_info_path, "scope")
                               ^---------
I resolved this to "/b/swarming/w/ir/cache/builder/src/third_party/android_deps/repository/android_arch_lifecycle_runtime/android_arch_lifecycle_runtime.info".
See //third_party/android_deps/BUILD.gn:149:1: whence it was called.
android_aar_prebuilt("android_arch_lifecycle_runtime_java") {
^------------------------------------------------------------
See //build/config/android/internal_rules.gni:117:23: which caused the file to be included.
            deps += [ "${_target_label}__build_config" ]
                      ^-------------------------------
GN gen failed: 1
# To recreate the file passed to --swarming-targets-file:
% cat > /b/swarming/w/ir/tmp/tmpyalibg <<EOF
telemetry_gpu_integration_test
EOF
%
step returned non-zero exit code: 1

Nothing seems to have changed build config in that regression range (r564324 .. r564340) so I assume it's external to the tree and therefore nothing can be rolled back.