[Background Fetch] Reject match() and matchAll()

when:
1. recordsAvailable is false
2. the background fetch is incomplete.

Bug: 882478
Change-Id: Id849a73370f8f07597039c3ccee5efce828fa452
Reviewed-on: https://chromium-review.googlesource.com/1226913Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592032}

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

@@ -178,6 +178,24 @@ ScriptPromise BackgroundFetchRegistration::MatchImpl(
   ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
   ScriptPromise promise = resolver->Promise();
 
+  // TODO(crbug.com/875201): Update this check once we support access to active
+  // fetches.
+  if (result_ == mojom::BackgroundFetchResult::UNSET) {
+    resolver->Reject(DOMException::Create(
+        DOMExceptionCode::kInvalidStateError,
+        "Access to records for in-progress background fetches is not yet "
+        "implemented. Please see crbug.com/875201 for more details."));
+    return promise;
+  }
+
+  if (!records_available_) {
+    resolver->Reject(DOMException::Create(
+        DOMExceptionCode::kInvalidStateError,
+        "The records associated with this background fetch are no longer "
+        "available."));
+    return promise;
+  }
+
   // Convert |request| to WebServiceWorkerRequest.
   base::Optional<WebServiceWorkerRequest> request_to_match;
   if (request.has_value()) {