Prerender Instant search base url on omnibox focus event

chrome/browser/ui/omnibox/omnibox_edit_model.cc

Index: chrome/browser/ui/omnibox/omnibox_edit_model.cc
diff --git a/chrome/browser/ui/omnibox/omnibox_edit_model.cc b/chrome/browser/ui/omnibox/omnibox_edit_model.cc
index 31205c495a8898acc70c723ef2d5f6ba05e16862..9905e09b43e3d0827074419f9e75e1b8bbd6b232 100644
--- a/chrome/browser/ui/omnibox/omnibox_edit_model.cc
+++ b/chrome/browser/ui/omnibox/omnibox_edit_model.cc
@@ -368,7 +368,7 @@ void OmniboxEditModel::OnChanged() {
   if (user_input_in_progress_) {
     InstantSearchPrerenderer* prerenderer =
         InstantSearchPrerenderer::GetForProfile(profile_);
-    if (prerenderer &&
+    if (prerenderer && !chrome::ShouldPrerenderInstantUrlOnOmniboxFocus() &&

[kmadhusu, 2014/06/18 16:23:50]

We should not add this check here. Consider the following case:

1. Open 2 browser windows.
2. Activate the new tab in browser_window_2. Since the omnibox has focus, we
should have prerendered an Instant search base page.
3. Don't type or switch to other tabs. Wait until the prerender manager times
out this prerendered page.
4. Now type a search query in the omnibox.

Expected behavior: We should have prerendered the Instant search base page and
used it to prefetch search results for the high-confidence query.
Actual behavior: Because of this check, we will never prerender the Instant
search base page after it is timed out.

[sidharthms, 2014/06/19 20:36:52]

Done.

         prerenderer->IsAllowed(current_match, controller_->GetWebContents()) &&
         popup_model()->IsOpen() && has_focus()) {
       recommended_action = AutocompleteActionPredictor::ACTION_PRERENDER;