Preload Instant search when omnibox is focused.

chrome/browser/instant/instant_controller.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 103 matching lines @@
   bool commit_on_mouse_up() const { return commit_on_mouse_up_; }
 
   // Returns true if the mouse is down as the result of activating the preview
   // content.
   bool IsMouseDownFromActivate();
 
   // The autocomplete edit that was initiating the current instant session has
   // lost focus. Commit or discard the preview accordingly.
   void OnAutocompleteLostFocus(gfx::NativeView view_gaining_focus);
 
+  // The autocomplete edit has gained focus. Preload the instant URL of the
+  // default search engine, in anticipation of the user typing a query.
+  void OnAutocompleteGotFocus(TabContentsWrapper* tab_contents);
+
   // Releases the preview TabContents passing ownership to the caller. This is
   // intended to be called when the preview TabContents is committed. This does
   // not notify the delegate.
   // WARNING: be sure and invoke CompleteRelease after adding the returned
   // TabContents to a tabstrip.
   TabContentsWrapper* ReleasePreviewContents(InstantCommitType type);
 
   // Does cleanup after the preview contents has been added to the tabstrip.
   // Invoke this if you explicitly invoke ReleasePreviewContents.
   void CompleteRelease(TabContentsWrapper* tab);
@@ skipping 163 matching lines @@
   ScopedVector<InstantLoader> loaders_to_destroy_;
 
   // The set of hosts that we don't use instant with. This is shared across all
   // instances and only maintained for the current session.
   static HostBlacklist* host_blacklist_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantController);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_