Prerender Instant search base url on omnibox focus event

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 8cd337440a1443a2a048d6ba99b7108cc5965f7a..4ec490e7a54fb3774925ec4e440e7afad591f04e 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -916,6 +916,9 @@ void Browser::TabInsertedAt(WebContents* contents,
       session_service->SetSelectedTabInWindow(session_id(),
                                               new_active_index);
   }
+
+  if (instant_controller_)
+    instant_controller_->TabInsertedAt(contents, index, foreground);

[kmadhusu, 2014/06/17 18:29:35]

As per our discussion, you are doing this to submit a prerender request when an
user adds a NTP. This only fixes the "Add new tab" workflow. This solution will
not work for the following use case:

1. Open a new tab (Tab_1) (This will submit a prerender request for Tab_1)
2. Open another new tab (Tab_2). (This will cancel the prerender request for
Tab_1 and submit a prerender request for Tab_2).
3. Switch to Tab_1  (This will cancel the prerender request for Tab_2 but will
not submit a prerender request for Tab_1 which we should have done because the
omnibox has focus).

[sidharthms, 2014/06/17 21:52:24]

Done.

 }
 
 void Browser::TabClosingAt(TabStripModel* tab_strip_model,