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

chrome/browser/tab_contents/language_state.h

Index: chrome/browser/tab_contents/language_state.h
diff --git a/chrome/browser/tab_contents/language_state.h b/chrome/browser/tab_contents/language_state.h
index 7fc405947bda08a8c58da87d6f7d22382e553a7b..e97e710e4769b312e3c2915fa8e4161a382f7f5c 100644
--- a/chrome/browser/tab_contents/language_state.h
+++ b/chrome/browser/tab_contents/language_state.h
@@ -44,6 +44,9 @@ class LanguageState {
   // Returns an empty string if the page should not be auto-translated.
   std::string AutoTranslateTo() const;
 
+  // Returns true if the user is navigating through translated links.
+  bool InTranslateNavigation() const;
+
   // Returns true if the current page in the associated tab has been translated.
   bool IsPageTranslated() const { return original_lang_ != current_lang_; }