Sample Extension for chrome.devtools.inspectedWindow.reload preprocessor option

chrome/common/extensions/docs/examples/api/devtools/inspectedWindow/chrome-preprocessor/Panel/InspectedWindowLoadMonitor.js

Index: chrome/common/extensions/docs/examples/api/devtools/inspectedWindow/chrome-preprocessor/Panel/InspectedWindowLoadMonitor.js
diff --git a/chrome/common/extensions/docs/examples/api/devtools/inspectedWindow/chrome-preprocessor/Panel/InspectedWindowLoadMonitor.js b/chrome/common/extensions/docs/examples/api/devtools/inspectedWindow/chrome-preprocessor/Panel/InspectedWindowLoadMonitor.js
new file mode 100644
index 0000000000000000000000000000000000000000..10eb8938e08d6d8ddc94e4728951487a2ae71cce
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/api/devtools/inspectedWindow/chrome-preprocessor/Panel/InspectedWindowLoadMonitor.js
@@ -0,0 +1,48 @@
+// Copyright (c) 2013 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.
+
+(function() {
+  /*
+   * @param {function} Called  after the 'load' event on the inspected window
+   * @ return {function} A function to be injected into the inspected window.

[Mike West, 2013/09/04 08:54:37]

Nit: space after @.

[johnjbarton, 2013/09/04 18:57:48]

Done.

+   */
+

[Mike West, 2013/09/04 08:54:37]

Nit: kill the newline.

[johnjbarton, 2013/09/04 18:57:48]

Done.

+  function LoadMonitor(onLoadedCallback) {
+
+    function checkForLoad() {
+      var expr = 'window.__inspectedWindowLoaded';
+      function onEval(isLoaded, isException) {
+        if (isException)
+          throw new Error('Eval failed for ' + expr, isException.value);
+        if (isLoaded)
+          onLoadedCallback();
+        else
+          pollForLoad();
+      }
+      chrome.devtools.inspectedWindow.eval(expr, onEval);
+    }
+
+    function pollForLoad() {
+      setTimeout(checkForLoad, 200);

[Mike West, 2013/09/04 08:54:37]

Hrm. Is there no event you could hook into? The polling logic is trivial, but
distracts from the point of the sample.

[Addy Osmani, 2013/09/04 12:28:02]

Afaik there isn't an alternative hook that could be used here. It might be worth
adding a comment that clarifies this in case.

[johnjbarton, 2013/09/04 18:57:48]

I added a fileoverview comment. See also
https://code.google.com/p/chromium/issues/detail?id=285295

+    }
+
+    pollForLoad();
+  }
+
+  LoadMonitor.prototype = {
+    // This function should be converted to a string and run in the Web page
+    injectedScript: function() {
+      // Initialize a secret data structure.
+      window.__inspectedWindowLoaded = false;
+      window.addEventListener('load', function() {
+        window.__inspectedWindowLoaded = true;
+      });
+    }
+  };
+
+  window.InspectedWindow = window.InspectedWindow || {};
+  InspectedWindow.LoadMonitor = LoadMonitor;
+})();
+
+