Move instant support to SearchTabHelper. Fix InstantTab reset.

chrome/browser/ui/search/search_tab_helper.h

 // Copyright 2012 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_UI_SEARCH_SEARCH_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/search/search_model.h"
@@ skipping 33 matching lines @@
 
   explicit SearchTabHelper(content::WebContents* web_contents);
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Overridden from contents::WebContentsObserver:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void DidFinishLoad(
+      int64 frame_id,
+      const GURL& validated_url,
+      bool is_main_frame,
+      content::RenderViewHost* render_view_host) OVERRIDE;
 
   // Sets the mode of the model based on the current URL of web_contents().
   void UpdateMode();
 
+  // Send an IPC to web_contents() to attempt to discover whether it supports
+  // instant.
+  void DetermineIfPageSupportsInstant();
+
   // Handlers for SearchBox API to show and hide top bars (bookmark and info
   // bars).
   void OnSearchBoxShowBars(int page_id);
   void OnSearchBoxHideBars(int page_id);
 
+  // Handler for when Instant support has been determined.
+  void OnInstantSupportDetermined(int page_id, bool supports_instant);
+
   const bool is_search_enabled_;
 
   // Tracks the last value passed to OmniboxEditModelChanged().
   bool user_input_in_progress_;
 
   // Model object for UI that cares about search state.
   SearchModel model_;
 
   content::NotificationRegistrar registrar_;
 
   content::WebContents* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_