Bug 1875781 - Add explicit non-default URLSearchParams deserializatio…

…n; r=dom-storage-reviewers,asuth

This is a preparation for bug 1636761 which needs to make URLSearchParams not
structured-cloneable. The deserialization uses the existing method
URLSearchParams::ReadStructuredClone for now, but it will be replaced with own
deserialization in bug 1636761 because URLSearchParams::ReadStructuredClone
will be removed.

Differential Revision: https://phabricator.services.mozilla.com/D199344

dom/indexedDB/IndexedDatabase.cpp

@@ -11,6 +11,7 @@
 
 #include "mozilla/dom/FileBlobImpl.h"
 #include "mozilla/dom/StructuredCloneTags.h"
+#include "mozilla/dom/URLSearchParams.h"
 #include "mozilla/dom/WorkerScope.h"
 #include "MainThreadUtils.h"
 #include "jsapi.h"
@@ -358,10 +359,37 @@ JSObject* CommonStructuredCloneReadCallback(
                     SCTAG_DOM_FILE_WITHOUT_LASTMODIFIEDDATE == 0xffff8002 &&
                     SCTAG_DOM_MUTABLEFILE == 0xffff8004 &&
                     SCTAG_DOM_FILE == 0xffff8005 &&
-                    SCTAG_DOM_WASM_MODULE == 0xffff8006,
+                    SCTAG_DOM_WASM_MODULE == 0xffff8006 &&
+                    SCTAG_DOM_URLSEARCHPARAMS == 0xffff8014,
                 "You changed our structured clone tag values and just ate "
                 "everyone's IndexedDB data.  I hope you are happy.");
 
+  if (aTag == SCTAG_DOM_URLSEARCHPARAMS) {
+    // Protect the result from a moving GC in ~RefPtr.
+    JS::Rooted<JSObject*> result(aCx);
+
+    {
+      // Scope for the RefPtr below.
+
+      nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
+      if (!global) {
+        return nullptr;
+      }
+
+      RefPtr<URLSearchParams> params =
+          URLSearchParams::ReadStructuredClone(aCx, global, aReader);
+      if (!params) {
+        return nullptr;
+      }
+
+      if (!WrapAsJSObject(aCx, params, &result)) {
+        return nullptr;
+      }
+    }
+
+    return result;
+  }
+
   using StructuredCloneFile =
       typename StructuredCloneReadInfo::StructuredCloneFile;