[OnionSoup] typemap network.mojom.RequestPriority with net::RequestPriority for Blink variant

This CL builds typemapping network.mojom.RequestPriority=net::RequestPriority
for Blink variant. Because the struct traits exist, we reuse them.

This CL is part of a series of CLs which are targeted to typemap
network.mojom.URLRequest with network::ResourceRequest for Blink variant
finally.

1. https://chromium-review.googlesource.com/c/chromium/src/+/1669131
2. This CL
3. https://chromium-review.googlesource.com/c/chromium/src/+/1680505
4. https://chromium-review.googlesource.com/c/chromium/src/+/1679984
5. https://chromium-review.googlesource.com/c/chromium/src/+/1683493

BUG=860403

Change-Id: Ibc736d0dd671f0057aa5484076effdea5d9c0941
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672768
Commit-Queue: Minggang Wang <minggang.wang@intel.com>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676246}

services/network/public/cpp/url_request_for_blink.typemap

@@ -4,7 +4,10 @@
 
 # TODO(minggang): Delete this file once all typemappings for network.mojom.URLRequest are done.
 mojom = "//services/network/public/mojom/url_loader.mojom"
-public_headers = [ "//services/network/public/cpp/resource_request_body.h" ]
+public_headers = [
+  "//net/base/request_priority.h",
+  "//services/network/public/cpp/resource_request_body.h",
+]
 traits_headers = [ "//services/network/public/cpp/url_request_mojom_traits.h" ]
 public_deps = [
   "//services/network/public/cpp:cpp_base",
@@ -12,4 +15,5 @@ public_deps = [
 type_mappings = [
   "network.mojom.DataElement=network::DataElement[move_only]",
   "network.mojom.URLRequestBody=scoped_refptr<network::ResourceRequestBody>[nullable_is_same_type,copyable_pass_by_value]",
+  "network.mojom.RequestPriority=net::RequestPriority",
 ]

third_party/blink/renderer/core/fetch/DEPS

@@ -4,4 +4,5 @@ include_rules = [
     "+mojo/public/cpp/bindings/binding_set.h",
     "+mojo/public/cpp/system/data_pipe.h",
     "+mojo/public/cpp/system/simple_watcher.h",
+    "+net/base/request_priority.h",
 ]

third_party/blink/renderer/core/fetch/fetch_request_data.cc

@@ -4,6 +4,7 @@
 
 #include "third_party/blink/renderer/core/fetch/fetch_request_data.h"
 
+#include "net/base/request_priority.h"
 #include "third_party/blink/public/platform/platform.h"
 #include "third_party/blink/public/platform/web_http_body.h"
 #include "third_party/blink/public/platform/web_url_request.h"
@@ -19,34 +20,30 @@
 #include "third_party/blink/renderer/platform/loader/fetch/resource_request.h"
 #include "third_party/blink/renderer/platform/network/http_names.h"
 
-namespace mojo {
+namespace {
 
-template <>
-struct TypeConverter<::blink::ResourceLoadPriority,
-                     network::mojom::blink::RequestPriority> {
-  static ::blink::ResourceLoadPriority Convert(
-      network::mojom::blink::RequestPriority priority) {
+::blink::ResourceLoadPriority ConvertRequestPriorityToResourceLoadPriority(
+    net::RequestPriority priority) {
   switch (priority) {
-      case network::mojom::blink::RequestPriority::kThrottled:
+    case net::RequestPriority::THROTTLED:
       break;
-      case network::mojom::blink::RequestPriority::kIdle:
+    case net::RequestPriority::IDLE:
       return ::blink::ResourceLoadPriority::kVeryLow;
-      case network::mojom::blink::RequestPriority::kLowest:
+    case net::RequestPriority::LOWEST:
       return ::blink::ResourceLoadPriority::kLow;
-      case network::mojom::blink::RequestPriority::kLow:
+    case net::RequestPriority::LOW:
       return ::blink::ResourceLoadPriority::kMedium;
-      case network::mojom::blink::RequestPriority::kMedium:
+    case net::RequestPriority::MEDIUM:
       return ::blink::ResourceLoadPriority::kHigh;
-      case network::mojom::blink::RequestPriority::kHighest:
+    case net::RequestPriority::HIGHEST:
       return ::blink::ResourceLoadPriority::kVeryHigh;
   }
 
   NOTREACHED() << priority;
   return blink::ResourceLoadPriority::kUnresolved;
-  }
-};
+}
 
-}  // namespace mojo
+}  // namespace
 
 namespace blink {
 
@@ -123,7 +120,7 @@ FetchRequestData* FetchRequestData::Create(
   request->SetKeepalive(fetch_api_request.keepalive);
   request->SetIsHistoryNavigation(fetch_api_request.is_history_navigation);
   request->SetPriority(
-      mojo::ConvertTo<ResourceLoadPriority>(fetch_api_request.priority));
+      ConvertRequestPriorityToResourceLoadPriority(fetch_api_request.priority));
   if (fetch_api_request.fetch_window_id)
     request->SetWindowId(fetch_api_request.fetch_window_id.value());
   return request;

third_party/blink/tools/blinkpy/presubmit/audit_non_blink_usage.py

@@ -772,6 +772,10 @@ _CONFIG = [
             'base::NullableString16',
             'net::ParseMimeTypeWithoutParameter',
         ],
+    },
+    {
+        'paths': ['third_party/blink/renderer/core/fetch/fetch_request_data.cc'],
+        'allowed': ['net::RequestPriority'],
     }
 ]