[use-counters] Map usage of display animations to WebDXFeatures

Bug: None
Change-Id: Ia4231dc1ad9255af1081dba7681dd6827e886b72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6023472
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1383337}

components/page_load_metrics/browser/observers/use_counter_page_load_metrics_observer.cc

@@ -703,6 +703,7 @@ UseCounterMetricsRecorder::GetAnimatedCSSProperties2WebDXFeatureMap() {
           // Uncomment this once that's resolved, or replace this with something
           // else that matches the resolution of the investigation
           // {CSSSampleId::kFontPalette, WebDXFeature::kFontPaletteAnimation}
+          {CSSSampleId::kDisplay, WebDXFeature::kDisplayAnimation},
       }};
 
   return *kMap;

third_party/blink/public/mojom/use_counter/metrics/webdx_feature.mojom

@@ -288,6 +288,7 @@ enum WebDXFeature {
   kScrollDrivenAnimations = 230,
   kWebAnimations = 231,
   kCrossDocumentViewTransition = 232,
+  kDisplayAnimation = 233,
 
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.

tools/metrics/histograms/enums.xml

@@ -33986,6 +33986,7 @@ Called by update_use_counter_feature_enum.py.-->
   <int value="230" label="ScrollDrivenAnimations"/>
   <int value="231" label="WebAnimations"/>
   <int value="232" label="CrossDocumentViewTransition"/>
+  <int value="233" label="DisplayAnimation"/>
 </enum>
 
 <!-- LINT.ThenChange(//third_party/blink/public/mojom/use_counter/metrics/webdx_feature.mojom:WebDXFeature) -->