The Tor Browser / file revision

 /* 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/. */

 function windowUtils() {

     return content.QueryInterface(Components.interfaces.nsIInterfaceRequestor)

                .getInterface(Components.interfaces.nsIDOMWindowUtils);

 }

 function recvSetViewport(w, h) {

     dump("setting viewport to "+ w +"x"+ h +"\n");

     windowUtils().setCSSViewport(w, h);

 }

 function recvSetDisplayPort(x, y, w, h) {

     dump("setting displayPort to <"+ x +", "+ y +", "+ w +", "+ h +">\n");

     windowUtils().setDisplayPortForElement(x, y, w, h, content.document.documentElement, 0);

 }

 function recvSetResolution(xres, yres) {

     dump("setting xres="+ xres +" yres="+ yres +"\n");

     windowUtils().setResolution(xres, yres);

 }

 function recvScrollBy(dx, dy) {

     content.scrollBy(dx, dy);

 }

 function recvScrollTo(x, y) {

     content.scrollTo(x, y);

 }

 addMessageListener(

     "setViewport",

     function (m) { recvSetViewport(m.json.w, m.json.h); }

 );

 addMessageListener(

     "setDisplayPort",

     function (m) { recvSetDisplayPort(m.json.x, m.json.y,

                                       m.json.w, m.json.h); }

 );

 addMessageListener(

     "setResolution",

     function (m) { recvSetResolution(m.json.xres, m.json.yres); }

 );

 addMessageListener(

     "scrollBy",

     function(m) { recvScrollBy(m.json.dx, m.json.dy); }

 );

 addMessageListener(

     "scrollTo",

     function(m) { recvScrollTo(m.json.x, m.json.y); }

 );