diff -r 000000000000 -r 6474c204b198 mobile/android/modules/LightweightThemeConsumer.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/modules/LightweightThemeConsumer.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+/* 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/. */
+
+let EXPORTED_SYMBOLS = ["LightweightThemeConsumer"];
+let Cc = Components.classes;
+let Ci = Components.interfaces;
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+Components.utils.import("resource://gre/modules/LightweightThemeManager.jsm");
+
+function LightweightThemeConsumer(aDocument) {
+  this._doc = aDocument;
+  Services.obs.addObserver(this, "lightweight-theme-styling-update", false);
+  Services.obs.addObserver(this, "lightweight-theme-apply", false);
+
+  this._update(LightweightThemeManager.currentThemeForDisplay);
+}
+
+LightweightThemeConsumer.prototype = {
+  observe: function (aSubject, aTopic, aData) {
+    if (aTopic == "lightweight-theme-styling-update")
+      this._update(JSON.parse(aData));
+    else if (aTopic == "lightweight-theme-apply")
+      this._update(LightweightThemeManager.currentThemeForDisplay);
+  },
+
+  destroy: function () {
+    Services.obs.removeObserver(this, "lightweight-theme-styling-update");
+    Services.obs.removeObserver(this, "lightweight-theme-apply");
+    this._doc = null;
+  },
+
+  _update: function (aData) {
+    if (!aData)
+      aData = { headerURL: "", footerURL: "", textcolor: "", accentcolor: "" };
+
+    let active = !!aData.headerURL;
+
+    let msg = active ? { type: "LightweightTheme:Update", data: aData } :
+                       { type: "LightweightTheme:Disable" };
+    Services.androidBridge.handleGeckoMessage(msg);
+  }
+}