Building the annotation checker.

We do not want every developer to have to build the auditor, and so we store the pre-built binary in a Google Cloud Storage bucket and retrieve it via gclient hooks.

To roll new versions of the binaries, you need to have write access to the chromium-tools-traffic_annotation bucket. If you don't, contact the OWNERS list in this folder, otherwise run:

On Linux:

git new-branch roll_traffic_annotation_tools

# These GN flags produce an optimized, stripped binary that has no dependency
# on glib.
gn gen --args='is_official_build=true use_ozone=true' out/Default

ninja -C out/Default traffic_annotation_auditor
cp -p out/Default/traffic_annotation_auditor \
    tools/traffic_annotation/bin/linux64

strip tools/traffic_annotation/bin/linux64/traffic_annotation_auditor

third_party/depot_tools/upload_to_google_storage.py \
    -b chromium-tools-traffic_annotation \
    tools/traffic_annotation/bin/linux64/traffic_annotation_auditor
sed -i '/^LASTCHANGE=/d' tools/traffic_annotation/bin/README.md
cat build/util/LASTCHANGE >> tools/traffic_annotation/bin/README.md
git commit -a -m 'Roll traffic_annotation checkers'
git cl upload

On Windows:

git new-branch roll_traffic_annotation_tools

# These GN flags produce an optimized, stripped binary that has no dependency
# on glib.
gn gen --args="is_official_build=true" out/Default

ninja -C out/Default traffic_annotation_auditor
cp -p out/Default/traffic_annotation_auditor.exe ^
    tools/traffic_annotation/bin/win32

python third_party/depot_tools/upload_to_google_storage.py ^
    -b chromium-tools-traffic_annotation ^
    tools/traffic_annotation/bin/win32/traffic_annotation_auditor.exe
sed -i "/^LASTCHANGE=/d" tools/traffic_annotation/bin/README.md
cat build/util/LASTCHANGE >> tools/traffic_annotation/bin/README.md
dos2unix tools/traffic_annotation/bin/README.md
git commit -a -m 'Roll traffic_annotation checkers'
git cl upload

and land the resulting CL.

The following line will be updated by the above script, and the modified README should be committed along with the updated .sha1 checksums.

LASTCHANGE=cdc4b63690632690274f67929ce0a49720eb1af3-refs/heads/main@{#913784} LASTCHANGE_YEAR=2021