Move LanguageState to the translate component

components/translate/content/browser/content_translate_driver.h

+// Copyright 2014 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_BROWSER_CONTENT_TRANSLATE_DRIVER_H_
+#define COMPONENTS_TRANSLATE_CONTENT_BROWSER_CONTENT_TRANSLATE_DRIVER_H_
+
+#include "components/translate/core/browser/translate_driver.h"
+
+#include "components/translate/core/browser/language_state.h"
+
+namespace content {
+struct LoadCommittedDetails;
+class NavigationController;
+class WebContents;
+}
+
+// Content implementation of TranslateDriver.
+class ContentTranslateDriver : public TranslateDriver {
+ public:
+
+  // The observer for the ContentTranslateDriver.
+  class Observer {
+   public:
+    // Handles when the value of IsPageTranslated is changed.
+    virtual void OnIsPageTranslatedChanged(content::WebContents* source) = 0;
+
+    // Handles when the value of translate_enabled is changed.
+    virtual void OnTranslateEnabledChanged(content::WebContents* source) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  ContentTranslateDriver(content::NavigationController* nav_controller);
+  virtual ~ContentTranslateDriver();
+
+  // Gets the language state.
+  LanguageState& language_state() { return language_state_; }
+
+  // Sets the Observer. Calling this method is optional.
+  void set_observer(Observer* observer) { observer_ = observer; }
+
+  // Must be called on navigations.
+  void DidNavigate(const content::LoadCommittedDetails& details);
+
+ private:
+  // TranslateDriver methods
+  virtual void OnIsPageTranslatedChanged() OVERRIDE;
+  virtual void OnTranslateEnabledChanged() OVERRIDE;
+  virtual bool IsLinkNavigation() OVERRIDE;
+
+  // The navigation controller of the tab we are associated with.
+  content::NavigationController* navigation_controller_;
+
+  LanguageState language_state_;
+  Observer* observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContentTranslateDriver);
+};
+
+#endif  // COMPONENTS_TRANSLATE_CONTENT_BROWSER_CONTENT_TRANSLATE_DRIVER_H_