Bug 1169180 - Workaround latent race caused by interacting with newly…

… opened chrome windows too soon. r=whimboo

(cherry picked from commit b70fbbf)

firefox_puppeteer/ui/windows.py

@@ -95,6 +95,14 @@ def create_window_instance(self, handle, expected_class=None):
         window = None
 
         try:
+            # Bug 1169180 - Workaround for handling newly opened chrome windows
+            # Once fixed revert back to make use of self.loaded
+            Wait(self.marionette).until(lambda mn: self.marionette.execute_script("""
+              Components.utils.import("resource://gre/modules/Services.jsm");
+              let win = Services.wm.getOuterWindowWithId(Number(arguments[0]));
+              return win.document.readyState == 'complete';
+            """, script_args=[handle]))
+
             # Retrieve window type to determine the type of chrome window
             if handle != self.marionette.current_chrome_window_handle:
                 self.switch_to(handle)
@@ -340,7 +348,6 @@ def window_opened(mn):
         assert new_handle is not None
 
         window = self._windows.create_window_instance(new_handle, expected_window_class)
-        Wait(self.marionette).until(lambda _: window.loaded)
 
         Wait(self.marionette).until(lambda _: window.focused == expect_focus)