[CacheStorage] Prioritize Size operations over other scheduled operations

content/browser/cache_storage/cache_storage_cache.cc

Index: content/browser/cache_storage/cache_storage_cache.cc
diff --git a/content/browser/cache_storage/cache_storage_cache.cc b/content/browser/cache_storage/cache_storage_cache.cc
index 0c9a85af10e9e1335df76d22b30cc8875c861830..21bcae03ffd96dafc8974aefb6de45f3103b5e38 100644
--- a/content/browser/cache_storage/cache_storage_cache.cc
+++ b/content/browser/cache_storage/cache_storage_cache.cc
@@ -443,14 +443,9 @@ void CacheStorageCache::Size(const SizeCallback& callback) {
     return;
   }
 
-  // If the cache isn't already initialized, wait for it.
   if (initializing_) {
-    SizeCallback pending_callback =
-        base::Bind(&CacheStorageCache::PendingSizeCallback,
-                   weak_ptr_factory_.GetWeakPtr(), callback);
-    scheduler_->ScheduleOperation(base::Bind(&CacheStorageCache::SizeImpl,
-                                             weak_ptr_factory_.GetWeakPtr(),
-                                             pending_callback));
+    // Note that Size doesn't use the scheduler, see header comments for why.
+    pending_size_callbacks_.push_back(callback);
     return;
   }
 
@@ -1296,6 +1291,10 @@ void CacheStorageCache::InitGotCacheSize(CacheStorageError cache_create_error,
                        ? BACKEND_OPEN
                        : BACKEND_CLOSED;
 
+  for (const SizeCallback& callback : pending_size_callbacks_)
+    SizeImpl(callback);
+  pending_size_callbacks_.clear();
+
   UMA_HISTOGRAM_ENUMERATION("ServiceWorkerCache.InitBackendResult",
                             cache_create_error, CACHE_STORAGE_ERROR_LAST + 1);