Check |errorCode| of translate.js and notify to Browser

components/translate/content/renderer/translate_helper.h

 // Copyright (c) 2011 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 COMPONENTS_TRANSLATE_CONTENT_RENDERER_TRANSLATE_HELPER_H_
 #define COMPONENTS_TRANSLATE_CONTENT_RENDERER_TRANSLATE_HELPER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 46 matching lines @@
   // Returns true if the translate library has been initialized successfully.
   virtual bool IsTranslateLibReady();
 
   // Returns true if the translation script has finished translating the page.
   virtual bool HasTranslationFinished();
 
   // Returns true if the translation script has reported an error performing the
   // translation.
   virtual bool HasTranslationFailed();
 
+  // Returns the error code generated in translate library.
+  virtual int64_t GetErrorCode();

[napper, 2017/06/16 12:41:51]

Can this method (and the one below) be const?

[Takashi Toyoshima, 2017/06/16 16:14:17]

IMHO, the method causes a side effect should not be const even though it does
not change member variables.
Especially for the method below, it executes arbitrary JavaScript code on v8.
That should not be const.

+
   // Starts the translation by calling the translate library.  This method
   // should only be called when the translate script has been injected in the
   // page.  Returns false if the call failed immediately.
   virtual bool StartTranslation();
 
   // Asks the Translate element in the page what the language of the page is.
   // Can only be called if a translation has happened and was successful.
   // Returns the language code on success, an empty string on failure.
   virtual std::string GetOriginalPageLanguage();
 
@@ skipping 14 matching lines @@
   // and returns the string returned by the script evaluation if the script was
   // run successfully. Otherwise, returns empty string.
   virtual std::string ExecuteScriptAndGetStringResult(
       const std::string& script);
 
   // Executes the JavaScript code in |script| in the main frame of RenderView.
   // and returns the number returned by the script evaluation if the script was
   // run successfully. Otherwise, returns 0.0.
   virtual double ExecuteScriptAndGetDoubleResult(const std::string& script);
 
+  // Executes the JavaScript code in |script| in the main frame of RenderView.
+  // and returns the integer value returned by the script evaluation if the
+  // script was run successfully. Otherwise, returns |fallback| value.
+  virtual int64_t ExecuteScriptAndGetIntegerResult(const std::string& script,
+                                                   int64_t fallback);
+
  private:
   // Converts language code to the one used in server supporting list.
   static void ConvertLanguageCodeSynonym(std::string* code);
 
   const mojom::ContentTranslateDriverPtr& GetTranslateDriver();
 
   // Cleanups all states and pending callbacks associated with the current
   // running page translation.
   void ResetPage();
 
@@ skipping 42 matching lines @@
 
   // Method factory used to make calls to TranslatePageImpl.
   base::WeakPtrFactory<TranslateHelper> weak_method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateHelper);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CONTENT_RENDERER_TRANSLATE_HELPER_H_