Revert "Remove WebIDE devtools component."

This reverts commit 8c1500707f.

# Conflicts:
#	application/basilisk/components/customizableui/CustomizableUI.jsm

devtools/client/webide/components/moz.build

@@ -0,0 +1,10 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXTRA_COMPONENTS += [
+    'webideCli.js',
+    'webideComponents.manifest',
+]

devtools/client/webide/components/webideCli.js

@@ -0,0 +1,58 @@
+/* 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 Ci = Components.interfaces;
+const Cu = Components.utils;
+
+const { XPCOMUtils } = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
+
+XPCOMUtils.defineLazyModuleGetter(this, "Services", "resource://gre/modules/Services.jsm");
+
+/**
+ * Handles --webide command line option.
+ */
+
+function webideCli() { }
+
+webideCli.prototype = {
+  handle: function (cmdLine) {
+    if (!cmdLine.handleFlag("webide", false)) {
+      return;
+    }
+
+    // If --webide is used remotely, we don't want to open
+    // a new tab.
+    //
+    // If --webide is used for a new Firefox instance, we
+    // want to open webide only.
+    cmdLine.preventDefault = true;
+
+    let win = Services.wm.getMostRecentWindow("devtools:webide");
+    if (win) {
+      win.focus();
+    } else {
+      win = Services.ww.openWindow(null,
+                                   "chrome://webide/content/",
+                                   "webide",
+                                   "chrome,centerscreen,resizable,dialog=no",
+                                   null);
+    }
+
+    if (cmdLine.state == Ci.nsICommandLine.STATE_INITIAL_LAUNCH) {
+      // If this is a new Firefox instance, and because we will only start
+      // webide, we need to notify "sessionstore-windows-restored" to trigger
+      // addons registration (for simulators and adb helper).
+      Services.obs.notifyObservers(null, "sessionstore-windows-restored", "");
+    }
+  },
+
+  helpInfo: "",
+
+  classID: Components.ID("{79b7b44e-de5e-4e4c-b7a2-044003c615d9}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsICommandLineHandler]),
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([webideCli]);

devtools/client/webide/components/webideComponents.manifest

@@ -0,0 +1,4 @@
+# webide components
+component {79b7b44e-de5e-4e4c-b7a2-044003c615d9} webideCli.js
+contract @mozilla.org/browser/webide-clh;1 {79b7b44e-de5e-4e4c-b7a2-044003c615d9}
+category command-line-handler a-webide @mozilla.org/browser/webide-clh;1