PlzNavigate: fix timing issue in app window creation

extensions/browser/app_window/app_window_contents.cc

Index: extensions/browser/app_window/app_window_contents.cc
diff --git a/extensions/browser/app_window/app_window_contents.cc b/extensions/browser/app_window/app_window_contents.cc
index 181e211dcd736d3fc7a1a61f5842547ac77ee843..ab366cca1541b5e250f604d00276b601df3a46d6 100644
--- a/extensions/browser/app_window/app_window_contents.cc
+++ b/extensions/browser/app_window/app_window_contents.cc
@@ -118,6 +118,13 @@ bool AppWindowContentsImpl::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
+void AppWindowContentsImpl::ReadyToCommitNavigation(
+    content::NavigationHandle* handle) {
+  if (is_window_ready_)
+    return;
+  host_->OnReadyToCommit();

[Devlin, 2015/09/16 21:44:04]

OnReadyToCommit() implies it might be called on *every* commit.  Maybe include a
"first" somewhere?

[clamy, 2015/09/16 22:19:39]

Done.

+}
+
 void AppWindowContentsImpl::UpdateDraggableRegions(
     const std::vector<DraggableRegion>& regions) {
   host_->UpdateDraggableRegions(regions);