This adds the onNetworkChanged event to networkingPrivate

chrome/test/data/extensions/api_test/networking/test.js

Index: chrome/test/data/extensions/api_test/networking/test.js
diff --git a/chrome/test/data/extensions/api_test/networking/test.js b/chrome/test/data/extensions/api_test/networking/test.js
index 5503ced293932998012d9546437436cd5d410326..dcccbc8dfcf19dfea06e0b15924bcc0f52ad72c1 100644
--- a/chrome/test/data/extensions/api_test/networking/test.js
+++ b/chrome/test/data/extensions/api_test/networking/test.js
@@ -80,6 +80,40 @@ chrome.test.runTests([
           assertEq("WiFi", result.Type);
         }));
   },
+  function propertiesChangeEvent() {
+      chrome.networkingPrivate.onNetworkChanged.addListener(
+          function (properties) {
+            assertEq(
+              [
+                {
+                  "ConnectionState": "Connected",
+                  "GUID": "stub_ethernet",
+                  "Name": "eth0",
+                  "Type": "Ethernet"
+                },
+                {
+                  "ConnectionState": "Connecting",
+                  "GUID": "stub_wifi1",
+                  "Name": "wifi1",
+                  "Type": "WiFi"
+                },
+                {
+                  "ConnectionState": "NotConnected",
+                  "GUID": "stub_wifi2",
+                  "Name": "wifi2_PSK",
+                  "Type": "WiFi"
+                },
+                {
+                  "ConnectionState": "NotConnected",
+                  "GUID": "stub_cellular1",
+                  "Name": "cellular1",
+                  "Type": "Cellular"
+                }
+              ], properties);
+          });

[not at google - send to devlin, 2013/02/05 21:43:20]

The event might (probably will) come in before the callback from startConnect
finishes. Need something like

var done = chrome.test.callbackAdded();
chrome.networkingPrivate.onNetworkChanged.addListener({
  ...
  done();
});

chrome.networkingPrivate.startConnect(...)

and I guess hope that the event only gets called once. Hm that's something we
should probably add, let's see how https://codereview.chromium.org/12218019
goes.

[Greg Spencer (Chromium), 2013/02/05 22:36:35]

Thanks, I was wondering how to do that.  Done.

+      chrome.networkingPrivate.startConnect("stub_wifi1",
+                                            callbackPass(function() {}));
+  },
   function startConnect() {
     chrome.networkingPrivate.startConnect("stub_wifi2",
                                           callbackPass(function() {}));