pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/modules/NetErrorHelper.jsm

@@ -0,0 +1,175 @@
+/* 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/. */
+"use strict";
+
+const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Messaging.jsm");
+Cu.import("resource://gre/modules/UITelemetry.jsm");
+
+this.EXPORTED_SYMBOLS = ["NetErrorHelper"];
+
+const KEY_CODE_ENTER = 13;
+
+/* Handlers is a list of objects that will be notified when an error page is shown
+ * or when an event occurs on the page that they are registered to handle. Registration
+ * is done by just adding yourself to the dictionary.
+ *
+ * handlers.myKey = {
+ *   onPageShown: function(browser) { },
+ *   handleEvent: function(event) { },
+ * }
+ *
+ * The key that you register yourself with should match the ID of the element you want to
+ * watch for click events on.
+ */
+
+var handlers = {};
+
+function NetErrorHelper(browser) {
+  browser.addEventListener("click", this.handleClick, true);
+
+  let listener = () => {
+    browser.removeEventListener("click", this.handleClick, true);
+    browser.removeEventListener("pagehide", listener, true);
+  };
+  browser.addEventListener("pagehide", listener, true);
+
+  // Handlers may want to customize the page
+  for (let id in handlers) {
+    if (handlers[id].onPageShown) {
+      handlers[id].onPageShown(browser);
+    }
+  }
+}
+
+NetErrorHelper.attachToBrowser = function(browser) {
+  return new NetErrorHelper(browser);
+}
+
+NetErrorHelper.prototype = {
+  handleClick: function(event) {
+    let node = event.target;
+
+    while(node) {
+      if (node.id in handlers && handlers[node.id].handleClick) {
+        handlers[node.id].handleClick(event);
+        return;
+      }
+
+      node = node.parentNode;
+    }
+  },
+}
+
+handlers.searchbutton = {
+  onPageShown: function(browser) {
+    let search = browser.contentDocument.querySelector("#searchbox");
+    if (!search) {
+      return;
+    }
+
+    let browserWin = Services.wm.getMostRecentWindow("navigator:browser");
+    let tab = browserWin.BrowserApp.getTabForBrowser(browser);
+
+    // If there is no stored userRequested, just hide the searchbox
+    if (!tab.userRequested) {
+      search.style.display = "none";
+    } else {
+      let text = browser.contentDocument.querySelector("#searchtext");
+      text.value = tab.userRequested;
+      text.addEventListener("keypress", (event) => {
+        if (event.keyCode === KEY_CODE_ENTER) {
+          this.doSearch(event.target.value);
+        }
+      });
+    }
+  },
+
+  handleClick: function(event) {
+    let value = event.target.previousElementSibling.value;
+    this.doSearch(value);
+  },
+
+  doSearch: function(value) {
+    UITelemetry.addEvent("neterror.1", "button", null, "search");
+    let engine = Services.search.defaultEngine;
+    let uri = engine.getSubmission(value).uri;
+
+    let browserWin = Services.wm.getMostRecentWindow("navigator:browser");
+    // Reset the user search to whatever the new search term was
+    browserWin.BrowserApp.loadURI(uri.spec, undefined, { isSearch: true, userRequested: value });
+  }
+};
+
+handlers.wifi = {
+  // This registers itself with the nsIObserverService as a weak ref,
+  // so we have to implement GetWeakReference as well.
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+                                         Ci.nsISupportsWeakReference]),
+
+  GetWeakReference: function() {
+    return Cu.getWeakReference(this);
+  },
+
+  onPageShown: function(browser) {
+      // If we have a connection, don't bother showing the wifi toggle.
+      let network = Cc["@mozilla.org/network/network-link-service;1"].getService(Ci.nsINetworkLinkService);
+      if (network.isLinkUp && network.linkStatusKnown) {
+        let nodes = browser.contentDocument.querySelectorAll("#wifi");
+        for (let i = 0; i < nodes.length; i++) {
+          nodes[i].style.display = "none";
+        }
+      }
+  },
+
+  handleClick: function(event) {
+    let node = event.target;
+    while(node && node.id !== "wifi") {
+      node = node.parentNode;
+    }
+
+    if (!node) {
+      return;
+    }
+
+    UITelemetry.addEvent("neterror.1", "button", null, "wifitoggle");
+    // Show indeterminate progress while we wait for the network.
+    node.disabled = true;
+    node.classList.add("inProgress");
+
+    this.node = Cu.getWeakReference(node);
+    Services.obs.addObserver(this, "network:link-status-changed", true);
+
+    Messaging.sendRequest({
+      type: "Wifi:Enable"
+    });
+  },
+
+  observe: function(subject, topic, data) {
+    let node = this.node.get();
+    if (!node) {
+      return;
+    }
+
+    // Remove the progress bar
+    node.disabled = false;
+    node.classList.remove("inProgress");
+
+    let network = Cc["@mozilla.org/network/network-link-service;1"].getService(Ci.nsINetworkLinkService);
+    if (network.isLinkUp && network.linkStatusKnown) {
+      // If everything worked, reload the page
+      UITelemetry.addEvent("neterror.1", "button", null, "wifitoggle.reload");
+      Services.obs.removeObserver(this, "network:link-status-changed");
+
+      // Even at this point, Android sometimes lies about the real state of the network and this reload request fails.
+      // Add a 500ms delay before refreshing the page.
+      node.ownerDocument.defaultView.setTimeout(function() {
+        node.ownerDocument.location.reload(false);
+      }, 500);
+    }
+  }
+}
+