[DevTools] Add ignoreListJSFramesOnTimeline experiment

Bug: 1161439
Frontend CL: https://crrev.com/c/2601966

Change-Id: If5f3a2799981d16d7830bf0508f4af7dba1c1c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601481Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Wolfgang Beyer <wolfi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839087}

tools/metrics/histograms/enums.xml

@@ -16983,6 +16983,7 @@ metrics consent we also won't be able to send UMA metrics. -->
   <int value="40" label="cspViolationsView"/>
   <int value="41" label="fontEditor"/>
   <int value="42" label="fullAccessibilityTree"/>
+  <int value="43" label="ignoreListJSFramesOnTimeline"/>
 </enum>
 
 <enum name="DevToolsGridOverlayOpenedFrom">