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diff --git a/docshell/test/browser/head.js b/docshell/test/browser/head.js
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+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* Helper function for timeline tests.  Returns an async task that is
+ * suitable for use as a particular timeline test.
+ * @param string frameScriptName
+ *        Base name of the frame script file.
+ * @param string url
+ *        URL to load.
+ */
+function makeTimelineTest(frameScriptName, url) {
+  info("in timelineTest");
+  return async function() {
+    info("in in timelineTest");
+    waitForExplicitFinish();
+
+    await timelineTestOpenUrl(url);
+
+    const here = "chrome://mochitests/content/browser/docshell/test/browser/";
+
+    let mm = gBrowser.selectedBrowser.messageManager;
+    mm.loadFrameScript(here + "frame-head.js", false);
+    mm.loadFrameScript(here + frameScriptName, false);
+
+    // Set up some listeners so that timeline tests running in the
+    // content process can forward their results to the main process.
+    mm.addMessageListener("browser:test:ok", function(message) {
+      ok(message.data.value, message.data.message);
+    });
+    mm.addMessageListener("browser:test:info", function(message) {
+      info(message.data.message);
+    });
+    mm.addMessageListener("browser:test:finish", function(ignore) {
+      gBrowser.removeCurrentTab();
+      finish();
+    });
+  };
+}
+
+/* Open a URL for a timeline test.  */
+function timelineTestOpenUrl(url) {
+  window.focus();
+
+  let tabSwitchPromise = new Promise((resolve, reject) => {
+    window.gBrowser.addEventListener(
+      "TabSwitchDone",
+      function() {
+        resolve();
+      },
+      { once: true }
+    );
+  });
+
+  let loadPromise = new Promise(function(resolve, reject) {
+    let browser = window.gBrowser;
+    let tab = (browser.selectedTab = BrowserTestUtils.addTab(browser, url));
+    let linkedBrowser = tab.linkedBrowser;
+
+    BrowserTestUtils.browserLoaded(linkedBrowser).then(() => resolve(tab));
+  });
+
+  return Promise.all([tabSwitchPromise, loadPromise]).then(([_, tab]) => tab);
+}
+
+/**
+ * Helper function for encoding override tests, loads URL, runs check1,
+ * forces encoding detection, runs check2.
+ */
+function runCharsetTest(url, check1, check2) {
+  waitForExplicitFinish();
+
+  BrowserTestUtils.openNewForegroundTab(gBrowser, url, true).then(afterOpen);
+
+  function afterOpen() {
+    BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser).then(
+      afterChangeCharset
+    );
+
+    SpecialPowers.spawn(gBrowser.selectedBrowser, [], check1).then(() => {
+      BrowserForceEncodingDetection();
+    });
+  }
+
+  function afterChangeCharset() {
+    SpecialPowers.spawn(gBrowser.selectedBrowser, [], check2).then(() => {
+      gBrowser.removeCurrentTab();
+      finish();
+    });
+  }
+}
+
+/**
+ * Helper function for charset tests. It loads |url| in a new tab,
+ * runs |check|.
+ */
+function runCharsetCheck(url, check) {
+  waitForExplicitFinish();
+
+  BrowserTestUtils.openNewForegroundTab(gBrowser, url, true).then(afterOpen);
+
+  function afterOpen() {
+    SpecialPowers.spawn(gBrowser.selectedBrowser, [], check).then(() => {
+      gBrowser.removeCurrentTab();
+      finish();
+    });
+  }
+}
+
+async function pushState(url, frameId) {
+  info(
+    `Doing a pushState, expecting to load ${url} ${
+      frameId ? "in an iframe" : ""
+    }`
+  );
+  let browser = gBrowser.selectedBrowser;
+  let bc = browser.browsingContext;
+  if (frameId) {
+    bc = await SpecialPowers.spawn(bc, [frameId], function(id) {
+      return content.document.getElementById(id).browsingContext;
+    });
+  }
+  let loaded = BrowserTestUtils.waitForLocationChange(gBrowser, url);
+  await SpecialPowers.spawn(bc, [url], function(url) {
+    content.history.pushState({}, "", url);
+  });
+  await loaded;
+  info(`Loaded ${url} ${frameId ? "in an iframe" : ""}`);
+}
+
+async function loadURI(url) {
+  info(`Doing a top-level loadURI, expecting to load ${url}`);
+  let browser = gBrowser.selectedBrowser;
+  let loaded = BrowserTestUtils.browserLoaded(browser, false, url);
+  BrowserTestUtils.loadURI(browser, url);
+  await loaded;
+  info(`Loaded ${url}`);
+}
+
+async function followLink(url, frameId) {
+  info(
+    `Creating and following a link to ${url} ${frameId ? "in an iframe" : ""}`
+  );
+  let browser = gBrowser.selectedBrowser;
+  let bc = browser.browsingContext;
+  if (frameId) {
+    bc = await SpecialPowers.spawn(bc, [frameId], function(id) {
+      return content.document.getElementById(id).browsingContext;
+    });
+  }
+  let loaded = BrowserTestUtils.browserLoaded(browser, !!frameId, url);
+  await SpecialPowers.spawn(bc, [url], function(url) {
+    let a = content.document.createElement("a");
+    a.href = url;
+    content.document.body.appendChild(a);
+    a.click();
+  });
+  await loaded;
+  info(`Loaded ${url} ${frameId ? "in an iframe" : ""}`);
+}
+
+async function goForward(url, useFrame = false) {
+  info(
+    `Clicking the forward button, expecting to load ${url} ${
+      useFrame ? "in an iframe" : ""
+    }`
+  );
+  let loaded = BrowserTestUtils.waitForLocationChange(gBrowser, url);
+  let forwardButton = document.getElementById("forward-button");
+  forwardButton.click();
+  await loaded;
+  info(`Loaded ${url} ${useFrame ? "in an iframe" : ""}`);
+}
+
+async function goBack(url, useFrame = false) {
+  info(
+    `Clicking the back button, expecting to load ${url} ${
+      useFrame ? "in an iframe" : ""
+    }`
+  );
+  let loaded = BrowserTestUtils.waitForLocationChange(gBrowser, url);
+  let backButton = document.getElementById("back-button");
+  backButton.click();
+  await loaded;
+  info(`Loaded ${url} ${useFrame ? "in an iframe" : ""}`);
+}
+
+function assertBackForwardState(canGoBack, canGoForward) {
+  let backButton = document.getElementById("back-button");
+  let forwardButton = document.getElementById("forward-button");
+
+  is(
+    backButton.disabled,
+    !canGoBack,
+    `${gBrowser.currentURI.spec}: back button is ${
+      canGoBack ? "not" : ""
+    } disabled`
+  );
+  is(
+    forwardButton.disabled,
+    !canGoForward,
+    `${gBrowser.currentURI.spec}: forward button is ${
+      canGoForward ? "not" : ""
+    } disabled`
+  );
+}
+
+class SHListener {
+  static NewEntry = 0;
+  static Reload = 1;
+  static GotoIndex = 2;
+  static Purge = 3;
+  static ReplaceEntry = 4;
+  static async waitForHistory(history, event) {
+    return new Promise(resolve => {
+      let listener = {
+        OnHistoryNewEntry: () => {},
+        OnHistoryReload: () => {
+          return true;
+        },
+        OnHistoryGotoIndex: () => {},
+        OnHistoryPurge: () => {},
+        OnHistoryReplaceEntry: () => {},
+
+        QueryInterface: ChromeUtils.generateQI([
+          "nsISHistoryListener",
+          "nsISupportsWeakReference",
+        ]),
+      };
+
+      function finish() {
+        history.removeSHistoryListener(listener);
+        resolve();
+      }
+      switch (event) {
+        case this.NewEntry:
+          listener.OnHistoryNewEntry = finish;
+          break;
+        case this.Reload:
+          listener.OnHistoryReload = () => {
+            finish();
+            return true;
+          };
+          break;
+        case this.GotoIndex:
+          listener.OnHistoryGotoIndex = finish;
+          break;
+        case this.Purge:
+          listener.OnHistoryPurge = finish;
+          break;
+        case this.ReplaceEntry:
+          listener.OnHistoryReplaceEntry = finish;
+          break;
+      }
+
+      history.addSHistoryListener(listener);
+    });
+  }
+}