PlzNavigate: support the WebRequest API

chrome/test/data/extensions/api_test/webrequest/test_simple.js

 // Copyright (c) 2011 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.
 
 // Constants as functions, not to be called until after runTests.
 function getURLHttpSimpleLoad() {
   return getServerURL('extensions/api_test/webrequest/simpleLoad/a.html');
 }
 
 function getURLHttpSimpleLoadRedirect() {
@@ skipping 28 matching lines @@
             url: getURL("simpleLoad/a.html"),
             statusCode: 200,
             fromCache: false,
             statusLine: "HTTP/1.1 200 OK",
             // Request to chrome-extension:// url has no IP.
           }
         },
       ],
       [  // event order
       ["a-onBeforeRequest", "a-onResponseStarted", "a-onCompleted"] ]);
+      console.log("Before simple load");

[Devlin, 2016/09/16 16:17:26]

nit: remove debugging logs

[clamy, 2016/09/19 15:10:03]

Done.

     navigateAndWait(getURL("simpleLoad/a.html"));
+      console.log("After simple load");
   },
 
   // Navigates to a blank page via HTTP. Only HTTP requests get the
   // onBeforeSendHeaders event.
   function simpleLoadHttp() {
     expect(
       [  // events
         { label: "onBeforeRequest-1",
           event: "onBeforeRequest",
           details: {
@@ skipping 89 matching lines @@
           }
         }
       ],
       [  // event order
         ["onBeforeRequest-1", "onBeforeSendHeaders-1", "onSendHeaders-1",
          "onHeadersReceived-1", "onBeforeRedirect",
          "onBeforeRequest-2", "onBeforeSendHeaders-2", "onSendHeaders-2",
          "onHeadersReceived-2", "onResponseStarted", "onCompleted"] ],
       {urls: ["<all_urls>"]},  // filter
       ["requestHeaders", "responseHeaders"]);
+      console.log("Before simple load redirect");
     navigateAndWait(getURLHttpSimpleLoadRedirect());
+      console.log("After simple load redirect");
   },
 
   // Navigates to a non-existing page.
   function nonExistingLoad() {
     expect(
       [  // events
         { label: "onBeforeRequest",
           event: "onBeforeRequest",
           details: {
             url: getURL("does_not_exist.html"),
             frameUrl: getURL("does_not_exist.html")
           }
         },
         { label: "onErrorOccurred",
           event: "onErrorOccurred",
           details: {
             url: getURL("does_not_exist.html"),
             fromCache: false,
             error: "net::ERR_FILE_NOT_FOUND",
             // Request to chrome-extension:// url has no IP.
           }
         },
       ],
       [  // event order
         ["onBeforeRequest", "onErrorOccurred"] ]);
+      console.log("Before does not exist");
     navigateAndWait(getURL("does_not_exist.html"));
+      console.log("After does not exist");
   },
 ]);