[Translate] Expose whether the user is within a navigation session as part of the infobar delegate

chrome/browser/translate/translate_infobar_delegate.cc

 // 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.
 
 #include "chrome/browser/translate/translate_infobar_delegate.h"
 
 #include <algorithm>
 
 #include "base/i18n/string_compare.h"
 #include "base/metrics/histogram.h"
@@ skipping 95 matching lines @@
   // translations when getting a LANGUAGE_DETERMINED from the page, which
   // happens when a load stops. That could happen multiple times, including
   // after the user already declined the translation.)
   TranslateTabHelper* translate_tab_helper =
       TranslateTabHelper::FromWebContents(web_contents());
   translate_tab_helper->language_state().set_translation_declined(true);
 
   UMA_HISTOGRAM_COUNTS("Translate.DeclineTranslate", 1);
 }
 
+bool TranslateInfoBarDelegate::InTranslateNavigation() {
+  TranslateTabHelper* translate_tab_helper =
+      TranslateTabHelper::FromWebContents(web_contents());
+  if (!translate_tab_helper)
+    return false;
+  return translate_tab_helper->language_state().InTranslateNavigation();
+}
+
 bool TranslateInfoBarDelegate::IsLanguageBlacklisted() {
   return prefs_.IsLanguageBlacklisted(original_language_code());
 }
 
 void TranslateInfoBarDelegate::ToggleLanguageBlacklist() {
   const std::string& original_lang = original_language_code();
   if (prefs_.IsLanguageBlacklisted(original_lang)) {
     prefs_.RemoveLanguageFromBlacklist(original_lang);
   } else {
     prefs_.BlacklistLanguage(original_lang);
@@ skipping 246 matching lines @@
 
 TranslateInfoBarDelegate*
     TranslateInfoBarDelegate::AsTranslateInfoBarDelegate() {
   return this;
 }
 
 std::string TranslateInfoBarDelegate::GetPageHost() {
   NavigationEntry* entry = web_contents()->GetController().GetActiveEntry();
   return entry ? entry->GetURL().HostNoBrackets() : std::string();
 }