// Copyright 2016 The Chromium Authors // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef THIRD_PARTY_BLINK_PUBLIC_COMMON_LOADER_LOADING_BEHAVIOR_FLAG_H_ #define THIRD_PARTY_BLINK_PUBLIC_COMMON_LOADER_LOADING_BEHAVIOR_FLAG_H_ #include namespace blink { // This enum tracks certain behavior Blink exhibits when loading a page. This is // for use in metrics collection by the loading team, to evaluate experimental // features and potential areas of improvement in the loading stack. The main // consumer is the page_load_metrics component, which sends bit flags to the // browser process for histogram splitting. enum LoadingBehaviorFlag : uint32_t { kLoadingBehaviorNone = 0, // Indicates that the page used the document.write evaluator to preload scan // for resources inserted via document.write. // DEPRECATED, feature has been turned down. kLoadingBehaviorDocumentWriteEvaluator = 1 << 0, // Indicates that the page is controlled by a Service Worker. kLoadingBehaviorServiceWorkerControlled = 1 << 1, // Indicates that the page has a synchronous, cross-origin document.written // script. kLoadingBehaviorDocumentWriteBlock = 1 << 2, // Indicates that the page is a reload and has a synchronous, cross-origin // document.written script. // DEPRECATED, metrics using this have been removed. kLoadingBehaviorDocumentWriteBlockReload = 1 << 3, // The page loaded external CSS that generated a PreloadRequest via the // CSSPreloaderResourceClient. kLoadingBehaviorCSSPreloadFound = 1 << 4, // Indicates that the page has a synchronous, same-origin document.written // script with different protocol. // DEPRECATED, metrics using this have been removed. kLoadingBehaviorDocumentWriteBlockDifferentScheme = 1 << 5, // Indicates that a subresource on the page matched the subresource filtering // rules. kLoadingBehaviorSubresourceFilterMatch = 1 << 6, // Indicates that the page is an AMP document, with tag. kLoadingBehaviorAmpDocumentLoaded = 1 << 7, // Indicates that an async script was ready to execute before the script // element's node document has finished parsing. kLoadingBehaviorAsyncScriptReadyBeforeDocumentFinishedParsing = 1 << 8, // Indicates that competing low priority requests were delayed. See // https://crbug.com/1112515 for details. kLoadingBehaviorCompetingLowPriorityRequestsDelayed = 1 << 9, // Indicates that the page is controlled by a Service Worker, but // the fetch handler is considered skippable. kLoadingBehaviorServiceWorkerFetchHandlerSkippable = 1 << 10, // Indicates that the main resource fetch for the page controlled by // a service worker at the navigation time fallback to network. kLoadingBehaviorServiceWorkerMainResourceFetchFallback = 1 << 11, // Indicates that the RaceNetworkRequest is dispatched for the main and // subresources. crbug.com/1420517 for more details. kLoadingBehaviorServiceWorkerRaceNetworkRequest = 1 << 12, // Indicates that the SyntheticResponse is used for the main resource. The // response header is served from the locally stored cache. This doesn't // guarantee that the synthetic response successfully returned the response. // The bit will be sent even in the fallback case e.g. inconsistent headers. // crbug.com/1420517 for more details. kLoadingBehaviorServiceWorkerSyntheticResponse = 1 << 13, }; inline LoadingBehaviorFlag operator|(LoadingBehaviorFlag a, LoadingBehaviorFlag b) { return static_cast(static_cast(a) | static_cast(b)); } inline LoadingBehaviorFlag& operator|=(LoadingBehaviorFlag& a, LoadingBehaviorFlag b) { a = a | b; return a; } } // namespace blink #endif // THIRD_PARTY_BLINK_PUBLIC_COMMON_LOADER_LOADING_BEHAVIOR_FLAG_H_