[Background Fetch] Measure Background Fetch feature usage

TBR=dgozman@chromium.org

Bug: 780025
Change-Id: I36e85988a6402bee5ca8fead28fddb64081c4133
Reviewed-on: https://chromium-review.googlesource.com/1246062
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595098}

third_party/blink/public/platform/web_feature.mojom

@@ -1999,6 +1999,12 @@ enum WebFeature {
   kSerialRequestPort = 2546,
   kSerialPortOpen = 2547,
   kSerialPortClose = 2548,
+  kBackgroundFetchManagerFetch = 2549,
+  kBackgroundFetchManagerGet = 2550,
+  kBackgroundFetchManagerGetIds = 2551,
+  kBackgroundFetchRegistrationAbort = 2552,
+  kBackgroundFetchRegistrationMatch = 2553,
+  kBackgroundFetchRegistrationMatchAll = 2554,
 
   // 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/background_fetch/background_fetch_manager.idl

@@ -8,7 +8,7 @@
     Exposed=(Window,Worker),
     RuntimeEnabled=BackgroundFetch
 ] interface BackgroundFetchManager {
-    [CallWith=ScriptState, RaisesException] Promise<BackgroundFetchRegistration> fetch(DOMString id, (RequestInfo or sequence<RequestInfo>) requests, optional BackgroundFetchOptions options);
-    [CallWith=ScriptState] Promise<BackgroundFetchRegistration?> get(DOMString id);
-    [CallWith=ScriptState] Promise<FrozenArray<DOMString>> getIds();
+    [CallWith=ScriptState, RaisesException, MeasureAs=BackgroundFetchManagerFetch] Promise<BackgroundFetchRegistration> fetch(DOMString id, (RequestInfo or sequence<RequestInfo>) requests, optional BackgroundFetchOptions options);
+    [CallWith=ScriptState, MeasureAs=BackgroundFetchManagerGet] Promise<BackgroundFetchRegistration?> get(DOMString id);
+    [CallWith=ScriptState, MeasureAs=BackgroundFetchManagerGetIds] Promise<FrozenArray<DOMString>> getIds();
 };

third_party/blink/renderer/modules/background_fetch/background_fetch_registration.idl

@@ -35,10 +35,10 @@ enum BackgroundFetchResult { "", "success", "failure" };
 
     attribute EventHandler onprogress;
 
-    [CallWith=ScriptState] Promise<boolean> abort();
+    [CallWith=ScriptState, MeasureAs=BackgroundFetchRegistrationAbort] Promise<boolean> abort();
 
     // TODO(crbug.com/875201): Change to (Window,Worker) once we support
     // match() and matchAll() for active fetches.
-    [CallWith=ScriptState, Exposed=ServiceWorker, RaisesException] Promise<BackgroundFetchRecord> match(RequestInfo request, optional CacheQueryOptions options);
-    [CallWith=ScriptState, Exposed=ServiceWorker, RaisesException] Promise<sequence<BackgroundFetchRecord>> matchAll(optional RequestInfo request, optional CacheQueryOptions options);
+    [CallWith=ScriptState, Exposed=ServiceWorker, RaisesException, MeasureAs=BackgroundFetchRegistrationMatch] Promise<BackgroundFetchRecord> match(RequestInfo request, optional CacheQueryOptions options);
+    [CallWith=ScriptState, Exposed=ServiceWorker, RaisesException, MeasureAs=BackgroundFetchRegistrationMatchAll] Promise<sequence<BackgroundFetchRecord>> matchAll(optional RequestInfo request, optional CacheQueryOptions options);
 };

tools/metrics/histograms/enums.xml

@@ -20244,6 +20244,12 @@ Called by update_net_error_codes.py.-->
   <int value="2546" label="SerialRequestPort"/>
   <int value="2547" label="SerialPortOpen"/>
   <int value="2548" label="SerialPortClose"/>
+  <int value="2549" label="BackgroundFetchManagerFetch"/>
+  <int value="2550" label="BackgroundFetchManagerGet"/>
+  <int value="2551" label="BackgroundFetchManagerGetIds"/>
+  <int value="2552" label="BackgroundFetchRegistrationAbort"/>
+  <int value="2553" label="BackgroundFetchRegistrationMatch"/>
+  <int value="2554" label="BackgroundFetchRegistrationMatchAll"/>
 </enum>
 
 <enum name="FeaturePolicyFeature">