Add UseCounter for registerRouter in InstallEvent

Record UseCounter when InstallEvent.registerRouter is called.  This is a
requirement to run Origin Trial.

UseCounter or UMAs for the router evaluation phase will be added in the
next CL.

Bug: 1371756
Change-Id: I525edcea06ca9789345a3e78740007c688ff803b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4630653
Reviewed-by: Yoshisato Yanagisawa <[email protected]>
Commit-Queue: Shunya Shishido <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1160511}

Author: sisidovski

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

@@ -3926,6 +3926,7 @@ enum WebFeature {
   kWebGPUQueueSubmit = 4586,
   kWebGPUCanvasContextGetCurrentTexture = 4587,
   kEditContext = 4588,
+  kServiceWorkerStaticRouter_RegisterRouter = 4589,
 
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.

third_party/blink/renderer/modules/service_worker/install_event.idl

@@ -10,5 +10,5 @@
     constructor(DOMString type, optional ExtendableEventInit eventInitDict = {});
     // Experimental
     // https://github.com/yoshisatoyanagisawa/service-worker-static-routing-api
-    [RuntimeEnabled=ServiceWorkerStaticRouter, CallWith=ScriptState] Promise<undefined> registerRouter((RouterRule or sequence<RouterRule>) rules);
+    [RuntimeEnabled=ServiceWorkerStaticRouter, CallWith=ScriptState, MeasureAs=ServiceWorkerStaticRouter_RegisterRouter] Promise<undefined> registerRouter((RouterRule or sequence<RouterRule>) rules);
 };

tools/metrics/histograms/enums.xml

@@ -43370,6 +43370,7 @@ Called by update_use_counter_feature_enum.py.-->
   <int value="4586" label="WebGPUQueueSubmit"/>
   <int value="4587" label="WebGPUCanvasContextGetCurrentTexture"/>
   <int value="4588" label="EditContext"/>
+  <int value="4589" label="ServiceWorkerStaticRouter_RegisterRouter"/>
 </enum>
 
 <enum name="FeaturePolicyAllowlistType">