Add getResourcePriority to WorkerInternals

This CL adds the getResourcePriority method to the WorkerInternals
interface via the partial interface defined in core/fetch. This will
help testing resource priorities fetched from worker contexts
(i.e., Service Workers). Before this CL, getResourcePriority was only
exposed on Internals, and thus all ResourceFetchers associated with
WorkerGlobalScopes could not be queried.

R=kinuko@chromium.org, yhirano@chromium.org, yoav@yoav.ws

Bug: 872776
Change-Id: I010b95441c191cf90dfda7b0d5f58c7e7d6c7c21
Reviewed-on: https://chromium-review.googlesource.com/1249882Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Dominic Farolino <domfarolino@gmail.com>
Cr-Commit-Position: refs/heads/master@{#595091}

third_party/blink/renderer/core/fetch/testing/worker_internals_fetch.cc

@@ -5,6 +5,9 @@
 #include "third_party/blink/renderer/core/fetch/testing/worker_internals_fetch.h"
 
 #include "third_party/blink/renderer/core/fetch/response.h"
+#include "third_party/blink/renderer/core/workers/worker_global_scope.h"
+#include "third_party/blink/renderer/platform/loader/fetch/resource_fetcher.h"
+#include "third_party/blink/renderer/platform/testing/url_test_helpers.h"
 #include "third_party/blink/renderer/platform/wtf/vector.h"
 
 namespace blink {
@@ -21,4 +24,20 @@ Vector<String> WorkerInternalsFetch::getInternalResponseURLList(
   return url_list;
 }
 
+int WorkerInternalsFetch::getResourcePriority(
+    WorkerInternals& internals,
+    const String& url,
+    WorkerGlobalScope* worker_global) {
+  if (!worker_global)
+    return static_cast<int>(ResourceLoadPriority::kUnresolved);
+
+  Resource* resource = worker_global->Fetcher()->AllResources().at(
+      URLTestHelpers::ToKURL(url.Utf8().data()));
+
+  if (!resource)
+    return static_cast<int>(ResourceLoadPriority::kUnresolved);
+
+  return static_cast<int>(resource->GetResourceRequest().Priority());
+}
+
 }  // namespace blink

third_party/blink/renderer/core/fetch/testing/worker_internals_fetch.h

@@ -11,6 +11,7 @@
 
 namespace blink {
 
+class WorkerGlobalScope;
 class WorkerInternals;
 class Response;
 
@@ -19,6 +20,9 @@ class WorkerInternalsFetch {
 
  public:
   static Vector<String> getInternalResponseURLList(WorkerInternals&, Response*);
+  static int getResourcePriority(WorkerInternals&,
+                                 const String& url,
+                                 WorkerGlobalScope*);
 };
 
 }  // namespace blink

third_party/blink/renderer/core/fetch/testing/worker_internals_fetch.idl

@@ -6,4 +6,5 @@
     ImplementedAs=WorkerInternalsFetch
 ] partial interface WorkerInternals {
     sequence<USVString> getInternalResponseURLList(Response response);
+    unsigned long getResourcePriority(DOMString url, WorkerGlobalScope worker_global);
 };