Lo-Fi snackbar should only be shown for the first q=low response of a page

chrome/browser/android/tab_android.h

 // Copyright (c) 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_ANDROID_TAB_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_TAB_ANDROID_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 110 matching lines @@
   bool HasPrerenderedUrl(GURL gurl);
 
   void MakeLoadURLParams(
       chrome::NavigateParams* params,
       content::NavigationController::LoadURLParams* load_url_params);
 
   bool HasOfflinePages() const;
   void ShowOfflinePages();
   void LoadOfflineCopy(const GURL& url);
 
+  void NotifyLoFiResponseReceived();
+
   // Overridden from CoreTabHelperDelegate:
   void SwapTabContents(content::WebContents* old_contents,
                        content::WebContents* new_contents,
                        bool did_start_load,
                        bool did_finish_load) override;
 
   // Overridden from InstantServiceObserver:
   void DefaultSearchProviderChanged(
       bool google_base_url_domain_changed) override;
 
@@ skipping 137 matching lines @@
   scoped_ptr<content::WebContents> web_contents_;
   scoped_ptr<chrome::android::TabWebContentsDelegateAndroid>
       web_contents_delegate_;
 
   scoped_ptr<browser_sync::SyncedTabDelegateAndroid> synced_tab_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TabAndroid);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_TAB_ANDROID_H_