The translate feature was only translating the main frame of the page....

chrome/renderer/translate/page_translator.h

 // Copyright (c) 2010 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_RENDERER_TRANSLATE_PAGE_TRANSLATOR_H_
 #define CHROME_RENDERER_TRANSLATE_PAGE_TRANSLATOR_H_
 
 #include <map>
 #include <set>
 #include <stack>
@@ skipping 30 matching lines @@
      virtual void PageTranslated(int page_id,
                                  const std::string& original_lang,
                                  const std::string& target_lang) = 0;
   };
 
   // The caller remains the owner of |text_translator|.
   PageTranslator(TextTranslator* text_translator,
                  PageTranslatorDelegate* delegate);
   virtual ~PageTranslator();
 
-  // Starts the translation process of |web_frame| from |source_lang| to
-  // |target_lang| where the languages are the ISO codes (ex: en, fr...).
-  void Translate(int page_id,
-                 WebKit::WebFrame* web_frame,
-                 std::string source_lang,
-                 std::string target_lang);
+  // Translate the text in the page contained in |main_frame|.
+  // It is translated from |source_lang| to |target_lang| where the languages
+  // are the ISO codes (ex: en, fr...).
+  // All sub-frames contained in |main_frame| are translated.
+  void TranslatePage(int page_id,
+                     WebKit::WebFrame* main_frame,
+                     std::string source_lang,
+                     std::string target_lang);
 
-  // Notification that the associated RenderView has navigated to a new page.
-  void NavigatedToNewPage();
+  // Translates the contents of |frame| if it has not already been translated
+  // and if the main frame was previously translated.
+  // (Note this should not be called for the main frame, use TranslatePage for
+  // it).
+  void TranslateFrame(WebKit::WebFrame* frame);
+
+  // Notification that the main frame of the current page has navigated.
+  // This invalidates all our page states.
+  void MainFrameNavigated();
+
+  // Returns true if the current page has been translated.
+  bool IsPageTranslated();
 
   // TextTranslator::Delegate implentation:
   virtual void TranslationError(int work_id, int error_id);
   virtual void TextTranslated(
       int work_id, const std::vector<string16>& translated_text);
 
  private:
   // Comparator used in set of WebKit WebStrings.
   struct WebStringCompare {
     bool operator()(const WebKit::WebString& s1,
@@ skipping 59 matching lines @@
   // The list of text zones in the current page, grouped in text zones (text
   // nodes grouped in a same context).
   std::vector<NodeList*> text_nodes_;
   // The original text of the text nodes in |text_nodes_|.
   std::vector<TextChunks*> text_chunks_;
 
   DISALLOW_COPY_AND_ASSIGN(PageTranslator);
 };
 
 #endif  // CHROME_RENDERER_TRANSLATE_PAGE_TRANSLATOR_H_