Contact emailsale...@chromium.org

Explainer
https://github.com/patcg-individual-drafts/private-aggregation-api/pull/135

Specification
https://github.com/patcg-individual-drafts/private-aggregation-api/pull/136

Summary

Modifies the Private Aggregation API to merge histogram contributions with
the same bucket and filtering ID before embedding in the aggregatable
report's encrypted payload. Private Aggregation imposes a limit on the
number of contributions that can be embedded in a single aggregatable
report, with any additional contributions being dropped. By merging
together contributions where possible, we can get additional utility out of
the limit. Note that, ignoring the dropping of excess contributions,
merging these sorts of contributions should not have any impact on the
final outputs (i.e. summary reports).


Blink componentBlink>PrivateAggregation
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EPrivateAggregation>

TAG reviewhttps://github.com/w3ctag/design-reviews/issues/846 (We have not
requested a signal for these changes specifically.)

TAG review statusPending

Risks


Interoperability and Compatibility

None


*Gecko*: No signal (
https://github.com/mozilla/standards-positions/issues/805) We have not
requested a signal for this change specifically. The Gecko position on
Shared Storage (one of the ways Private Aggregation is exposed) is negative.

*WebKit*: No signal (
https://github.com/WebKit/standards-positions/issues/189) We have not
requested a signal for this change specifically.

*Web developers*: Positive (
https://github.com/patcg-individual-drafts/private-aggregation-api/issues/81
)

*Other signals*:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?

None


Debuggability

No new debug capabilities beyond the existing internals page
(chrome://private-aggregation-internals) and temporary debug mode. These
capabilities will reflect the merged contributions.


Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, ChromeOS, Android, and Android WebView)?

All but WebView


Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

Flag name on chrome://flagsNone

Finch feature namePrivateAggregationApiContributionMerging

Requires code in //chrome?False

Tracking bughttps://crbug.com/349980058

Launch bughttps://launch.corp.google.com/launch/4333118

Estimated milestones
Shipping on desktop 129
Shipping on Android 129

Anticipated spec changes

None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5094168719523840?gate=5075771428438016

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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