Bug 1793647, part 1 - Create new Sec-Fetch-Dest value for WebIdentity (FedCM), r=freddyb,webdriver-reviewers,whimboo

This is to keep up with WHATWG Fetch https://github.com/whatwg/fetch/pull/1495 .
Also revised to not include the new destination type in the RequestDestination enum, per https://github.com/whatwg/fetch/pull/1500 .

I added an element to nsIContentPolicy::nsContentPolicyType as my starting point and
proceeded from there, following the instructions at the end of the internal enum.

Differential Revision: https://phabricator.services.mozilla.com/D158657

devtools/server/actors/network-monitor/utils/network-utils.js

@@ -51,6 +51,7 @@ const LOAD_CAUSE_STRINGS = {
   [Ci.nsIContentPolicy.TYPE_FETCH]: "fetch",
   [Ci.nsIContentPolicy.TYPE_IMAGESET]: "imageset",
   [Ci.nsIContentPolicy.TYPE_WEB_MANIFEST]: "webManifest",
+  [Ci.nsIContentPolicy.TYPE_WEB_IDENTITY]: "webidentity",
 };
 
 exports.causeTypeToString = function(

dom/base/nsContentPolicyUtils.h

@@ -145,6 +145,7 @@ inline const char* NS_CP_ContentTypeName(nsContentPolicyType contentType) {
     CASE_RETURN(TYPE_INTERNAL_FETCH_PRELOAD);
     CASE_RETURN(TYPE_UA_FONT);
     CASE_RETURN(TYPE_PROXIED_WEBRTC_MEDIA);
+    CASE_RETURN(TYPE_WEB_IDENTITY);
     case nsIContentPolicy::TYPE_INVALID:
       break;
       // Do not add default: so that compilers can catch the missing case.

dom/base/nsIContentPolicy.idl

@@ -427,6 +427,12 @@ interface nsIContentPolicy : nsISupports
      */
     TYPE_PROXIED_WEBRTC_MEDIA = 56,
 
+    /**
+     * Indicates the load of data via the Federated Credential Management API
+     * with data destined for a browser context.
+     */
+     TYPE_WEB_IDENTITY = 57,
+
     /* When adding new content types, please update
      * NS_CP_ContentTypeName, nsCSPContext, CSP_ContentTypeToDirective,
      * DoContentSecurityChecks, all nsIContentPolicy implementations, the

dom/cache/DBSchema.cpp

@@ -341,7 +341,8 @@ static_assert(
         nsIContentPolicy::TYPE_INTERNAL_CHROMEUTILS_COMPILED_SCRIPT == 52 &&
         nsIContentPolicy::TYPE_INTERNAL_FRAME_MESSAGEMANAGER_SCRIPT == 53 &&
         nsIContentPolicy::TYPE_INTERNAL_FETCH_PRELOAD == 54 &&
-        nsIContentPolicy::TYPE_UA_FONT == 55,
+        nsIContentPolicy::TYPE_UA_FONT == 55 &&
+        nsIContentPolicy::TYPE_WEB_IDENTITY == 57,
     "nsContentPolicyType values are as expected");
 
 namespace {

dom/fetch/InternalRequest.cpp

@@ -302,6 +302,8 @@ RequestDestination InternalRequest::MapContentPolicyTypeToRequestDestination(
       return RequestDestination::Paintworklet;
     case nsIContentPolicy::TYPE_PROXIED_WEBRTC_MEDIA:
       return RequestDestination::_empty;
+    case nsIContentPolicy::TYPE_WEB_IDENTITY:
+      return RequestDestination::_empty;
     case nsIContentPolicy::TYPE_INVALID:
       break;
       // Do not add default: so that compilers can catch the missing case.

dom/security/SecFetch.cpp

@@ -106,6 +106,8 @@ nsCString MapInternalContentPolicyTypeToDest(nsContentPolicyType aType) {
       return "empty"_ns;
     case nsIContentPolicy::TYPE_PROXIED_WEBRTC_MEDIA:
       return "empty"_ns;
+    case nsIContentPolicy::TYPE_WEB_IDENTITY:
+      return "webidentity"_ns;
     case nsIContentPolicy::TYPE_INVALID:
       break;
       // Do not add default: so that compilers can catch the missing case.

dom/security/nsCSPUtils.cpp

@@ -322,6 +322,7 @@ CSPDirective CSP_ContentTypeToDirective(nsContentPolicyType aType) {
     case nsIContentPolicy::TYPE_INTERNAL_XMLHTTPREQUEST:
     case nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE:
     case nsIContentPolicy::TYPE_INTERNAL_FETCH_PRELOAD:
+    case nsIContentPolicy::TYPE_WEB_IDENTITY:
       return nsIContentSecurityPolicy::CONNECT_SRC_DIRECTIVE;
 
     case nsIContentPolicy::TYPE_OBJECT:

ipc/glue/IPCMessageUtilsSpecializations.h

@@ -329,7 +329,7 @@ template <>
 struct ParamTraits<nsContentPolicyType>
     : public ContiguousEnumSerializerInclusive<
           nsContentPolicyType, nsIContentPolicy::TYPE_INVALID,
-          nsIContentPolicy::TYPE_INTERNAL_FETCH_PRELOAD> {};
+          nsIContentPolicy::TYPE_WEB_IDENTITY> {};
 
 template <>
 struct ParamTraits<mozilla::TimeDuration> {

remote/cdp/domains/parent/Network.sys.mjs

@@ -28,6 +28,7 @@ const LOAD_CAUSE_STRINGS = {
   [Ci.nsIContentPolicy.TYPE_FETCH]: "Fetch",
   [Ci.nsIContentPolicy.TYPE_IMAGESET]: "Imageset",
   [Ci.nsIContentPolicy.TYPE_WEB_MANIFEST]: "WebManifest",
+  [Ci.nsIContentPolicy.TYPE_WEB_IDENTITY]: "Webidentity",
 };
 
 export class Network extends Domain {