Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 756 insertions, 0 deletions

diff --git a/remote/cdp/domains/parent/Page.sys.mjs b/remote/cdp/domains/parent/Page.sys.mjs
new file mode 100644
index 0000000000..7b32ad6497
--- /dev/null
+++ b/remote/cdp/domains/parent/Page.sys.mjs
@@ -0,0 +1,756 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { Domain } from "chrome://remote/content/cdp/domains/Domain.sys.mjs";
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  SessionStore: "resource:///modules/sessionstore/SessionStore.sys.mjs",
+
+  DialogHandler:
+    "chrome://remote/content/cdp/domains/parent/page/DialogHandler.sys.mjs",
+  generateUUID: "chrome://remote/content/shared/UUID.sys.mjs",
+  PollPromise: "chrome://remote/content/shared/Sync.sys.mjs",
+  print: "chrome://remote/content/shared/PDF.sys.mjs",
+  streamRegistry: "chrome://remote/content/cdp/domains/parent/IO.sys.mjs",
+  Stream: "chrome://remote/content/cdp/StreamRegistry.sys.mjs",
+  TabManager: "chrome://remote/content/shared/TabManager.sys.mjs",
+  UnsupportedError: "chrome://remote/content/cdp/Error.sys.mjs",
+  windowManager: "chrome://remote/content/shared/WindowManager.sys.mjs",
+});
+
+const MAX_CANVAS_DIMENSION = 32767;
+const MAX_CANVAS_AREA = 472907776;
+
+const PRINT_MAX_SCALE_VALUE = 2.0;
+const PRINT_MIN_SCALE_VALUE = 0.1;
+
+const PDF_TRANSFER_MODES = {
+  base64: "ReturnAsBase64",
+  stream: "ReturnAsStream",
+};
+
+const TIMEOUT_SET_HISTORY_INDEX = 1000;
+
+export class Page extends Domain {
+  constructor(session) {
+    super(session);
+
+    this._onDialogLoaded = this._onDialogLoaded.bind(this);
+    this._onRequest = this._onRequest.bind(this);
+
+    this.enabled = false;
+
+    this.session.networkObserver.startTrackingBrowserNetwork(
+      this.session.target.browser
+    );
+    this.session.networkObserver.on("request", this._onRequest);
+  }
+
+  destructor() {
+    // Flip a flag to avoid to disable the content domain from this.disable()
+    this._isDestroyed = false;
+    this.disable();
+
+    this.session.networkObserver.off("request", this._onRequest);
+    this.session.networkObserver.stopTrackingBrowserNetwork(
+      this.session.target.browser
+    );
+    super.destructor();
+  }
+
+  // commands
+
+  /**
+   * Navigates current page to given URL.
+   *
+   * @param {object} options
+   * @param {string} options.url
+   *     destination URL
+   * @param {string=} options.frameId
+   *     frame id to navigate (not supported),
+   *     if not specified navigate top frame
+   * @param {string=} options.referrer
+   *     referred URL (optional)
+   * @param {string=} options.transitionType
+   *     intended transition type
+   * @returns {object}
+   *         - frameId {string} frame id that has navigated (or failed to)
+   *         - errorText {string=} error message if navigation has failed
+   *         - loaderId {string} (not supported)
+   */
+  async navigate(options = {}) {
+    const { url, frameId, referrer, transitionType } = options;
+    if (typeof url != "string") {
+      throw new TypeError("url: string value expected");
+    }
+    let validURL;
+    try {
+      validURL = Services.io.newURI(url);
+    } catch (e) {
+      throw new Error("Error: Cannot navigate to invalid URL");
+    }
+    const topFrameId = this.session.browsingContext.id.toString();
+    if (frameId && frameId != topFrameId) {
+      throw new lazy.UnsupportedError("frameId not supported");
+    }
+
+    const hitsNetwork = ["https", "http"].includes(validURL.scheme);
+    let networkLessLoaderId;
+    if (!hitsNetwork) {
+      // This navigation will not hit the network, use a randomly generated id.
+      networkLessLoaderId = lazy.generateUUID();
+
+      // Update the content process map of loader ids.
+      await this.executeInChild("_updateLoaderId", {
+        frameId: this.session.browsingContext.id,
+        loaderId: networkLessLoaderId,
+      });
+    }
+
+    const currentURI = this.session.browsingContext.currentURI;
+
+    const isSameDocumentNavigation =
+      // The "host", "query" and "ref" getters can throw if the URLs are not
+      // http/https, so verify first that both currentURI and validURL are
+      // using http/https.
+      hitsNetwork &&
+      ["https", "http"].includes(currentURI.scheme) &&
+      currentURI.host === validURL.host &&
+      currentURI.query === validURL.query &&
+      !!validURL.ref;
+
+    const requestDone = new Promise(resolve => {
+      if (isSameDocumentNavigation) {
+        // Per CDP documentation, same-document navigations should not emit any
+        // loader id (https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-navigate)
+        resolve({});
+        return;
+      }
+
+      if (!hitsNetwork) {
+        // This navigation will not hit the network, use a randomly generated id.
+        resolve({ navigationRequestId: networkLessLoaderId });
+        return;
+      }
+      let navigationRequestId, redirectedRequestId;
+      const _onNavigationRequest = function (_type, _ch, data) {
+        const {
+          url: requestURL,
+          requestId,
+          redirectedFrom = null,
+          isNavigationRequest,
+        } = data;
+        if (!isNavigationRequest) {
+          return;
+        }
+        if (validURL.spec === requestURL) {
+          navigationRequestId = redirectedRequestId = requestId;
+        } else if (redirectedFrom === redirectedRequestId) {
+          redirectedRequestId = requestId;
+        }
+      };
+
+      const _onRequestFinished = function (_type, _ch, data) {
+        const { requestId, errorCode } = data;
+        if (
+          redirectedRequestId !== requestId ||
+          errorCode == "NS_BINDING_REDIRECTED"
+        ) {
+          // handle next request in redirection chain
+          return;
+        }
+        this.session.networkObserver.off("request", _onNavigationRequest);
+        this.session.networkObserver.off("requestfinished", _onRequestFinished);
+        resolve({ errorCode, navigationRequestId });
+      }.bind(this);
+
+      this.session.networkObserver.on("request", _onNavigationRequest);
+      this.session.networkObserver.on("requestfinished", _onRequestFinished);
+    });
+
+    const opts = {
+      loadFlags: transitionToLoadFlag(transitionType),
+      referrerURI: referrer,
+      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+    };
+    this.session.browsingContext.loadURI(validURL, opts);
+    // clients expect loaderId == requestId for a document navigation request
+    const { navigationRequestId: loaderId, errorCode } = await requestDone;
+    const result = {
+      frameId: topFrameId,
+      loaderId,
+    };
+    if (errorCode) {
+      result.errorText = errorCode;
+    }
+    return result;
+  }
+
+  /**
+   * Capture page screenshot.
+   *
+   * @param {object} options
+   * @param {Viewport=} options.clip
+   *     Capture the screenshot of a given region only.
+   * @param {string=} options.format
+   *     Image compression format. Defaults to "png".
+   * @param {number=} options.quality
+   *     Compression quality from range [0..100] (jpeg only). Defaults to 80.
+   *
+   * @returns {string}
+   *     Base64-encoded image data.
+   */
+  async captureScreenshot(options = {}) {
+    const { clip, format = "png", quality = 80 } = options;
+
+    if (options.fromSurface) {
+      throw new lazy.UnsupportedError("fromSurface not supported");
+    }
+
+    let rect;
+    let scale = await this.executeInChild("_devicePixelRatio");
+
+    if (clip) {
+      for (const prop of ["x", "y", "width", "height", "scale"]) {
+        if (clip[prop] == undefined) {
+          throw new TypeError(`clip.${prop}: double value expected`);
+        }
+      }
+
+      const contentRect = await this.executeInChild("_contentRect");
+
+      // For invalid scale values default to full page
+      if (clip.scale <= 0) {
+        Object.assign(clip, {
+          x: 0,
+          y: 0,
+          width: contentRect.width,
+          height: contentRect.height,
+          scale: 1,
+        });
+      } else {
+        if (clip.x < 0 || clip.x > contentRect.width - 1) {
+          clip.x = 0;
+        }
+        if (clip.y < 0 || clip.y > contentRect.height - 1) {
+          clip.y = 0;
+        }
+        if (clip.width <= 0) {
+          clip.width = contentRect.width;
+        }
+        if (clip.height <= 0) {
+          clip.height = contentRect.height;
+        }
+      }
+
+      rect = new DOMRect(clip.x, clip.y, clip.width, clip.height);
+      scale *= clip.scale;
+    } else {
+      // If no specific clipping region has been specified,
+      // fallback to the layout (fixed) viewport, and the
+      // default pixel ratio.
+      const { pageX, pageY, clientWidth, clientHeight } =
+        await this.executeInChild("_layoutViewport");
+
+      rect = new DOMRect(pageX, pageY, clientWidth, clientHeight);
+    }
+
+    let canvasWidth = rect.width * scale;
+    let canvasHeight = rect.height * scale;
+
+    // Cap the screenshot size based on maximum allowed canvas sizes.
+    // Using higher dimensions would trigger exceptions in Gecko.
+    //
+    // See: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas#Maximum_canvas_size
+    if (canvasWidth > MAX_CANVAS_DIMENSION) {
+      rect.width = Math.floor(MAX_CANVAS_DIMENSION / scale);
+      canvasWidth = rect.width * scale;
+    }
+    if (canvasHeight > MAX_CANVAS_DIMENSION) {
+      rect.height = Math.floor(MAX_CANVAS_DIMENSION / scale);
+      canvasHeight = rect.height * scale;
+    }
+    // If the area is larger, reduce the height to keep the full width.
+    if (canvasWidth * canvasHeight > MAX_CANVAS_AREA) {
+      rect.height = Math.floor(MAX_CANVAS_AREA / (canvasWidth * scale));
+      canvasHeight = rect.height * scale;
+    }
+
+    const { browsingContext, window } = this.session.target;
+    const snapshot = await browsingContext.currentWindowGlobal.drawSnapshot(
+      rect,
+      scale,
+      "rgb(255,255,255)"
+    );
+
+    const canvas = window.document.createElementNS(
+      "http://www.w3.org/1999/xhtml",
+      "canvas"
+    );
+    canvas.width = canvasWidth;
+    canvas.height = canvasHeight;
+
+    const ctx = canvas.getContext("2d");
+    ctx.drawImage(snapshot, 0, 0);
+
+    // Bug 1574935 - Huge dimensions can trigger an OOM because multiple copies
+    // of the bitmap will exist in memory. Force the removal of the snapshot
+    // because it is no longer needed.
+    snapshot.close();
+
+    const url = canvas.toDataURL(`image/${format}`, quality / 100);
+    if (!url.startsWith(`data:image/${format}`)) {
+      throw new lazy.UnsupportedError(`Unsupported MIME type: image/${format}`);
+    }
+
+    // only return the base64 encoded data without the data URL prefix
+    const data = url.substring(url.indexOf(",") + 1);
+
+    return { data };
+  }
+
+  async enable() {
+    if (this.enabled) {
+      return;
+    }
+
+    this.enabled = true;
+
+    const { browser } = this.session.target;
+    this._dialogHandler = new lazy.DialogHandler(browser);
+    this._dialogHandler.on("dialog-loaded", this._onDialogLoaded);
+    await this.executeInChild("enable");
+  }
+
+  async disable() {
+    if (!this.enabled) {
+      return;
+    }
+
+    this._dialogHandler.destructor();
+    this._dialogHandler = null;
+    this.enabled = false;
+
+    if (!this._isDestroyed) {
+      // Only call disable in the content domain if we are not destroying the domain.
+      // If we are destroying the domain, the content domains will be destroyed
+      // independently after firing the remote:destroy event.
+      await this.executeInChild("disable");
+    }
+  }
+
+  async bringToFront() {
+    const { tab, window } = this.session.target;
+
+    // Focus the window, and select the corresponding tab
+    await lazy.windowManager.focusWindow(window);
+    await lazy.TabManager.selectTab(tab);
+  }
+
+  /**
+   * Return metrics relating to the layouting of the page.
+   *
+   * The returned object contains the following entries:
+   *
+   * layoutViewport:
+   *     {number} pageX
+   *         Horizontal offset relative to the document (CSS pixels)
+   *     {number} pageY
+   *         Vertical offset relative to the document (CSS pixels)
+   *     {number} clientWidth
+   *         Width (CSS pixels), excludes scrollbar if present
+   *     {number} clientHeight
+   *         Height (CSS pixels), excludes scrollbar if present
+   *
+   * visualViewport:
+   *     {number} offsetX
+   *         Horizontal offset relative to the layout viewport (CSS pixels)
+   *     {number} offsetY
+   *         Vertical offset relative to the layout viewport (CSS pixels)
+   *     {number} pageX
+   *         Horizontal offset relative to the document (CSS pixels)
+   *     {number} pageY
+   *         Vertical offset relative to the document (CSS pixels)
+   *     {number} clientWidth
+   *         Width (CSS pixels), excludes scrollbar if present
+   *     {number} clientHeight
+   *         Height (CSS pixels), excludes scrollbar if present
+   *     {number} scale
+   *         Scale relative to the ideal viewport (size at width=device-width)
+   *     {number} zoom
+   *         Page zoom factor (CSS to device independent pixels ratio)
+   *
+   * contentSize:
+   *     {number} x
+   *         X coordinate
+   *     {number} y
+   *         Y coordinate
+   *     {number} width
+   *         Width of scrollable area
+   *     {number} height
+   *         Height of scrollable area
+   *
+   * @returns {Promise<object>}
+   *     Promise which resolves with an object with the following properties
+   *     layoutViewport and contentSize
+   */
+  async getLayoutMetrics() {
+    return {
+      layoutViewport: await this.executeInChild("_layoutViewport"),
+      contentSize: await this.executeInChild("_contentRect"),
+    };
+  }
+
+  /**
+   * Returns navigation history for the current page.
+   *
+   * @returns {Promise<object>}
+   *     Promise which resolves with an object with the following properties
+   *     currentIndex (number) and entries (Array<NavigationEntry>).
+   */
+  async getNavigationHistory() {
+    const { window } = this.session.target;
+
+    return new Promise(resolve => {
+      function updateSessionHistory(sessionHistory) {
+        const entries = sessionHistory.entries.map(entry => {
+          return {
+            id: entry.ID,
+            url: entry.url,
+            userTypedURL: entry.originalURI || entry.url,
+            title: entry.title,
+            // TODO: Bug 1609514
+            transitionType: null,
+          };
+        });
+
+        resolve({
+          currentIndex: sessionHistory.index,
+          entries,
+        });
+      }
+
+      lazy.SessionStore.getSessionHistory(
+        window.gBrowser.selectedTab,
+        updateSessionHistory
+      );
+    });
+  }
+
+  /**
+   * Interact with the currently opened JavaScript dialog (alert, confirm,
+   * prompt) for this page. This will always close the dialog, either accepting
+   * or rejecting it, with the optional prompt filled.
+   *
+   * @param {object} options
+   * @param {boolean=} options.accept
+   *    for "confirm", "prompt", "beforeunload" dialogs true will accept
+   *    the dialog, false will cancel it. For "alert" dialogs, true or
+   *    false closes the dialog in the same way.
+   * @param {string=} options.promptText
+   *    for "prompt" dialogs, used to fill the prompt input.
+   */
+  async handleJavaScriptDialog(options = {}) {
+    const { accept, promptText } = options;
+
+    if (!this.enabled) {
+      throw new Error("Page domain is not enabled");
+    }
+    await this._dialogHandler.handleJavaScriptDialog({ accept, promptText });
+  }
+
+  /**
+   * Navigates current page to the given history entry.
+   *
+   * @param {object} options
+   * @param {number} options.entryId
+   *    Unique id of the entry to navigate to.
+   */
+  async navigateToHistoryEntry(options = {}) {
+    const { entryId } = options;
+
+    const index = await this._getIndexForHistoryEntryId(entryId);
+
+    if (index == null) {
+      throw new Error("No entry with passed id");
+    }
+
+    const { window } = this.session.target;
+    window.gBrowser.gotoIndex(index);
+
+    // On some platforms the requested index isn't set immediately.
+    await lazy.PollPromise(
+      async (resolve, reject) => {
+        const currentIndex = await this._getCurrentHistoryIndex();
+        if (currentIndex == index) {
+          resolve();
+        } else {
+          reject();
+        }
+      },
+      { timeout: TIMEOUT_SET_HISTORY_INDEX }
+    );
+  }
+
+  /**
+   * Print page as PDF.
+   *
+   * @param {object} options
+   * @param {boolean=} options.displayHeaderFooter
+   *     Display header and footer. Defaults to false.
+   * @param {string=} options.footerTemplate (not supported)
+   *     HTML template for the print footer.
+   * @param {string=} options.headerTemplate (not supported)
+   *     HTML template for the print header. Should use the same format
+   *     as the footerTemplate.
+   * @param {boolean=} options.ignoreInvalidPageRanges
+   *     Whether to silently ignore invalid but successfully parsed page ranges,
+   *     such as '3-2'. Defaults to false.
+   * @param {boolean=} options.landscape
+   *     Paper orientation. Defaults to false.
+   * @param {number=} options.marginBottom
+   *     Bottom margin in inches. Defaults to 1cm (~0.4 inches).
+   * @param {number=} options.marginLeft
+   *     Left margin in inches. Defaults to 1cm (~0.4 inches).
+   * @param {number=} options.marginRight
+   *     Right margin in inches. Defaults to 1cm (~0.4 inches).
+   * @param {number=} options.marginTop
+   *     Top margin in inches. Defaults to 1cm (~0.4 inches).
+   * @param {string=} options.pageRanges (not supported)
+   *     Paper ranges to print, e.g., '1-5, 8, 11-13'.
+   *     Defaults to the empty string, which means print all pages.
+   * @param {number=} options.paperHeight
+   *     Paper height in inches. Defaults to 11 inches.
+   * @param {number=} options.paperWidth
+   *     Paper width in inches. Defaults to 8.5 inches.
+   * @param {boolean=} options.preferCSSPageSize
+   *     Whether or not to prefer page size as defined by CSS.
+   *     Defaults to false, in which case the content will be scaled
+   *     to fit the paper size.
+   * @param {boolean=} options.printBackground
+   *     Print background graphics. Defaults to false.
+   * @param {number=} options.scale
+   *     Scale of the webpage rendering. Defaults to 1.
+   * @param {string=} options.transferMode
+   *     Return as base64-encoded string (ReturnAsBase64),
+   *     or stream (ReturnAsStream). Defaults to ReturnAsBase64.
+   *
+   * @returns {Promise<{data:string, stream:Stream}>}
+   *     Based on the transferMode setting data is a base64-encoded string,
+   *     or stream is a Stream.
+   */
+  async printToPDF(options = {}) {
+    const {
+      displayHeaderFooter = false,
+      // Bug 1601570 - Implement templates for header and footer
+      // headerTemplate = "",
+      // footerTemplate = "",
+      landscape = false,
+      marginBottom = 0.39,
+      marginLeft = 0.39,
+      marginRight = 0.39,
+      marginTop = 0.39,
+      // Bug 1601571 - Implement handling of page ranges
+      // TODO: pageRanges = "",
+      // TODO: ignoreInvalidPageRanges = false,
+      paperHeight = 11.0,
+      paperWidth = 8.5,
+      preferCSSPageSize = false,
+      printBackground = false,
+      scale = 1.0,
+      transferMode = PDF_TRANSFER_MODES.base64,
+    } = options;
+
+    if (marginBottom < 0) {
+      throw new TypeError("marginBottom is negative");
+    }
+    if (marginLeft < 0) {
+      throw new TypeError("marginLeft is negative");
+    }
+    if (marginRight < 0) {
+      throw new TypeError("marginRight is negative");
+    }
+    if (marginTop < 0) {
+      throw new TypeError("marginTop is negative");
+    }
+    if (scale < PRINT_MIN_SCALE_VALUE || scale > PRINT_MAX_SCALE_VALUE) {
+      throw new TypeError("scale is outside [0.1 - 2] range");
+    }
+    if (paperHeight <= 0) {
+      throw new TypeError("paperHeight is zero or negative");
+    }
+    if (paperWidth <= 0) {
+      throw new TypeError("paperWidth is zero or negative");
+    }
+
+    const psService = Cc["@mozilla.org/gfx/printsettings-service;1"].getService(
+      Ci.nsIPrintSettingsService
+    );
+
+    const printSettings = psService.createNewPrintSettings();
+    printSettings.isInitializedFromPrinter = true;
+    printSettings.isInitializedFromPrefs = true;
+    printSettings.outputFormat = Ci.nsIPrintSettings.kOutputFormatPDF;
+    printSettings.printerName = "";
+    printSettings.printSilent = true;
+
+    printSettings.paperSizeUnit = Ci.nsIPrintSettings.kPaperSizeInches;
+    printSettings.paperWidth = paperWidth;
+    printSettings.paperHeight = paperHeight;
+
+    // Override any os-specific unwriteable margins
+    printSettings.unwriteableMarginTop = 0;
+    printSettings.unwriteableMarginLeft = 0;
+    printSettings.unwriteableMarginBottom = 0;
+    printSettings.unwriteableMarginRight = 0;
+
+    printSettings.marginBottom = marginBottom;
+    printSettings.marginLeft = marginLeft;
+    printSettings.marginRight = marginRight;
+    printSettings.marginTop = marginTop;
+
+    printSettings.printBGColors = printBackground;
+    printSettings.printBGImages = printBackground;
+    printSettings.scaling = scale;
+    printSettings.shrinkToFit = preferCSSPageSize;
+
+    if (!displayHeaderFooter) {
+      printSettings.headerStrCenter = "";
+      printSettings.headerStrLeft = "";
+      printSettings.headerStrRight = "";
+      printSettings.footerStrCenter = "";
+      printSettings.footerStrLeft = "";
+      printSettings.footerStrRight = "";
+    }
+
+    if (landscape) {
+      printSettings.orientation = Ci.nsIPrintSettings.kLandscapeOrientation;
+    }
+
+    const retval = { data: null, stream: null };
+    const { linkedBrowser } = this.session.target.tab;
+
+    if (transferMode === PDF_TRANSFER_MODES.stream) {
+      // If we are returning a stream, we write the PDF to disk so that we don't
+      // keep (potentially very large) PDFs in memory. We can then stream them
+      // to the client via the returned Stream.
+      //
+      // NOTE: This is a potentially premature optimization -- it might be fine
+      // to keep these PDFs in memory, but we don't have specifics on how CDP is
+      // used in the field so it is possible that leaving the PDFs in memory
+      // could cause a regression.
+      const path = await IOUtils.createUniqueFile(
+        PathUtils.tempDir,
+        "remote-agent.pdf"
+      );
+
+      printSettings.outputDestination =
+        Ci.nsIPrintSettings.kOutputDestinationFile;
+      printSettings.toFileName = path;
+
+      await linkedBrowser.browsingContext.print(printSettings);
+
+      retval.stream = lazy.streamRegistry.add(new lazy.Stream(path));
+    } else {
+      const binaryString = await lazy.print.printToBinaryString(
+        linkedBrowser.browsingContext,
+        printSettings
+      );
+
+      retval.data = btoa(binaryString);
+    }
+
+    return retval;
+  }
+
+  /**
+   * Intercept file chooser requests and transfer control to protocol clients.
+   *
+   * When file chooser interception is enabled,
+   * the native file chooser dialog is not shown.
+   * Instead, a protocol event Page.fileChooserOpened is emitted.
+   *
+   * @param {object} options
+   * @param {boolean=} options.enabled
+   *     Enabled state of file chooser interception.
+   */
+  setInterceptFileChooserDialog(options = {}) {}
+
+  _getCurrentHistoryIndex() {
+    const { window } = this.session.target;
+
+    return new Promise(resolve => {
+      lazy.SessionStore.getSessionHistory(
+        window.gBrowser.selectedTab,
+        history => {
+          resolve(history.index);
+        }
+      );
+    });
+  }
+
+  _getIndexForHistoryEntryId(id) {
+    const { window } = this.session.target;
+
+    return new Promise(resolve => {
+      function updateSessionHistory(sessionHistory) {
+        sessionHistory.entries.forEach((entry, index) => {
+          if (entry.ID == id) {
+            resolve(index);
+          }
+        });
+
+        resolve(null);
+      }
+
+      lazy.SessionStore.getSessionHistory(
+        window.gBrowser.selectedTab,
+        updateSessionHistory
+      );
+    });
+  }
+
+  /**
+   * Emit the proper CDP event javascriptDialogOpening when a javascript dialog
+   * opens for the current target.
+   */
+  _onDialogLoaded(e, data) {
+    const { message, type } = data;
+    // XXX: We rely on the tabmodal-dialog-loaded event (see DialogHandler.jsm)
+    // which is inconsistent with the name "javascriptDialogOpening".
+    // For correctness we should rely on an event fired _before_ the prompt is
+    // visible, such as DOMWillOpenModalDialog. However the payload of this
+    // event does not contain enough data to populate javascriptDialogOpening.
+    //
+    // Since the event is fired asynchronously, this should not have an impact
+    // on the actual tests relying on this API.
+    this.emit("Page.javascriptDialogOpening", { message, type });
+  }
+
+  /**
+   * Handles HTTP request to propagate loaderId to events emitted from
+   * content process
+   */
+  _onRequest(_type, _ch, data) {
+    if (!data.loaderId) {
+      return;
+    }
+    this.executeInChild("_updateLoaderId", {
+      loaderId: data.loaderId,
+      frameId: data.frameId,
+    });
+  }
+}
+
+function transitionToLoadFlag(transitionType) {
+  switch (transitionType) {
+    case "reload":
+      return Ci.nsIWebNavigation.LOAD_FLAGS_IS_REFRESH;
+    case "link":
+    default:
+      return Ci.nsIWebNavigation.LOAD_FLAGS_IS_LINK;
+  }
+}