| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // 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_ |
| |
| 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 { |
| 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. |
| 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. |
| 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 <html amp> tag. |
| kLoadingBehaviorAmpDocumentLoaded = 1 << 7, |
| // Indicates that the page uses the Next.js JavaScript framework (via a |
| // window variable) |
| kLoadingBehaviorNextJSFrameworkUsed = 1 << 8, |
| // Indicates that an async script was ready to execute before the script |
| // element's node document has finished parsing. |
| kLoadingBehaviorAsyncScriptReadyBeforeDocumentFinishedParsing = 1 << 9, |
| // Indicates that competing low priority requests were delayed. See |
| // https://crbug.com/1112515 for details. |
| kLoadingBehaviorCompetingLowPriorityRequestsDelayed = 1 << 10, |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_PUBLIC_COMMON_LOADER_LOADING_BEHAVIOR_FLAG_H_ |
