DevTools: allow inspecting browsers using custom front-ends.

chrome/browser/resources/inspect/inspect.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var MIN_VERSION_TAB_CLOSE = 25;
 var MIN_VERSION_TARGET_ID = 26;
 var MIN_VERSION_NEW_TAB = 29;
 var MIN_VERSION_TAB_ACTIVATE = 30;
 
+var queryParamsObject = {};
+
+(function() {
+var queryParams = window.location.search;
+if (!queryParams)
+    return;
+var params = queryParams.substring(1).split('&');
+for (var i = 0; i < params.length; ++i) {
+    var pair = params[i].split('=');
+    queryParamsObject[pair[0]] = pair[1];
+}
+
+})();
+
 function sendCommand(command, args) {
   chrome.send(command, Array.prototype.slice.call(arguments, 1));
 }
 
 function sendTargetCommand(command, target) {
   sendCommand(command, target.source, target.id);
 }
 
 function removeChildren(element_id) {
   var element = $(element_id);
@@ skipping 240 matching lines @@
           }.bind(null, openHandler), true);
 
           var newPageButton = document.createElement('button');
           newPageButton.textContent = 'Open';
           newPage.appendChild(newPageButton);
           newPageButton.addEventListener('click', openHandler, true);
 
           browserHeader.appendChild(newPage);
         }
 
+        if (queryParamsObject['browser-inspector']) {
+          var link = document.createElement('span');
+          link.classList.add('action');
+          link.setAttribute('tabindex', 1);
+          link.textContent = 'inspect';
+          browserHeader.appendChild(link);
+          link.addEventListener(
+              'click',
+              sendCommand.bind(null, 'inspect-browser', browser.source,
+                  browser.id, queryParamsObject['browser-inspector']), false);
+        }
+
         pageList = document.createElement('div');
         pageList.className = 'list pages';
         browserSection.appendChild(pageList);
       }
 
       if (incompatibleVersion || alreadyDisplayed(browserSection, browser))
         continue;
 
       pageList.textContent = '';
       for (var p = 0; p < browser.pages.length; p++) {
@@ skipping 562 matching lines @@
     deviceSection.querySelector('.device-ports').textContent = '';
   }
 
   Array.prototype.forEach.call(
       document.querySelectorAll('.device'), clearPorts);
 }
 
 document.addEventListener('DOMContentLoaded', onload);
 
 window.addEventListener('hashchange', onHashChange);