[Extensions] Propagate activeTab hosts to extension background pages

chrome/test/data/extensions/api_test/active_tab/iframe.js

Index: chrome/test/data/extensions/api_test/active_tab/iframe.js
diff --git a/chrome/test/data/extensions/api_test/active_tab/iframe.js b/chrome/test/data/extensions/api_test/active_tab/iframe.js
new file mode 100644
index 0000000000000000000000000000000000000000..da70af91735f705472d3696944ce9c79e19ba48c
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/active_tab/iframe.js
@@ -0,0 +1,19 @@
+function canXhr(url) {

[not at google - send to devlin, 2015/02/05 22:40:23]

you might get a copyright header presubmit fail if you don't add one

[Devlin, 2015/02/06 18:59:53]

Done.

+  var xhr = new XMLHttpRequest();
+  xhr.open('GET', url, false);
+  var success = true;
+  try {
+    xhr.send();
+  } catch(e) {
+    success = false;
+    console.error(e);

[not at google - send to devlin, 2015/02/05 22:40:23]

Do you really want to be logging this?

(also same comment re asserting this is a NetworkError)

[Devlin, 2015/02/06 18:59:53]

Nope!

+  }
+  return success;
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+  chrome.runtime.sendMessage({message:'xhr'}, function(response) {
+    var success = canXhr(response.url);
+    chrome.runtime.sendMessage({success:success});
+  });
+});