Bug 1841859 - Part 1: Move ReferrerPolicy to ScriptLoadRequest and LoadedScript. r=jonco,smaug

Suggested by jonco during review,
https://phabricator.services.mozilla.com/D186944#inline-1036982

Differential Revision: https://phabricator.services.mozilla.com/D187385

js/loader/ScriptLoadRequest.h

@@ -71,6 +71,12 @@ enum class ParserMetadata {
  *      implemented in ScriptLoadRequest, as it changes for every
  *      ScriptLoadRequest.
  *
+ *   referrerPolicy
+ *     For a module script, its referrerPolicy will be updated if there is a
+ *     HTTP Response 'REFERRER-POLICY' header, given this value may be different
+ *     for every ScriptLoadRequest, so we store it directly in
+ *     ScriptLoadRequest.
+ *
  * In the case of classic scripts without dynamic import, this object is
  * used once. For modules, this object is propogated throughout the module
  * tree. If there is a dynamically imported module in any type of script,
@@ -84,9 +90,7 @@ class ScriptFetchOptions {
   NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(ScriptFetchOptions)
   NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(ScriptFetchOptions)
 
-  ScriptFetchOptions(mozilla::CORSMode aCORSMode,
-                     enum mozilla::dom::ReferrerPolicy aReferrerPolicy,
-                     const nsAString& aNonce,
+  ScriptFetchOptions(mozilla::CORSMode aCORSMode, const nsAString& aNonce,
                      mozilla::dom::RequestPriority aFetchPriority,
                      const ParserMetadata aParserMetadata,
                      nsIPrincipal* aTriggeringPrincipal,
@@ -99,12 +103,6 @@ class ScriptFetchOptions {
    */
   const mozilla::CORSMode mCORSMode;
 
-  /*
-   *  The referrer policy used for the initial fetch and for fetching any
-   *  imported modules
-   */
-  const enum mozilla::dom::ReferrerPolicy mReferrerPolicy;
-
   /*
    * The cryptographic nonce metadata used for the initial fetch and for
    * fetching any imported modules.
@@ -182,6 +180,7 @@ class ScriptLoadRequest
  public:
   using SRIMetadata = mozilla::dom::SRIMetadata;
   ScriptLoadRequest(ScriptKind aKind, nsIURI* aURI,
+                    mozilla::dom::ReferrerPolicy aReferrerPolicy,
                     ScriptFetchOptions* aFetchOptions,
                     const SRIMetadata& aIntegrity, nsIURI* aReferrer,
                     LoadContextBase* aContext);
@@ -298,7 +297,7 @@ class ScriptLoadRequest
   }
 
   enum mozilla::dom::ReferrerPolicy ReferrerPolicy() const {
-    return mFetchOptions->mReferrerPolicy;
+    return mReferrerPolicy;
   }
 
   enum ParserMetadata ParserMetadata() const {
@@ -343,6 +342,10 @@ class ScriptLoadRequest
   State mState;           // Are we still waiting for a load to complete?
   bool mFetchSourceOnly;  // Request source, not cached bytecode.
   DataType mDataType;     // Does this contain Source or Bytecode?
+
+  // The referrer policy used for the initial fetch and for fetching any
+  // imported modules
+  enum mozilla::dom::ReferrerPolicy mReferrerPolicy;
   RefPtr<ScriptFetchOptions> mFetchOptions;
   const SRIMetadata mIntegrity;
   const nsCOMPtr<nsIURI> mReferrer;