Implemented new Translate API for purely Objective-C clients.

ios/web_view/internal/translate/cwv_translation_controller_internal.h

Index: ios/web_view/internal/translate/cwv_translation_controller_internal.h
diff --git a/ios/web_view/internal/translate/cwv_translation_controller_internal.h b/ios/web_view/internal/translate/cwv_translation_controller_internal.h
new file mode 100644
index 0000000000000000000000000000000000000000..6bad58839d415ec15b3da11757b95d3a5680774f
--- /dev/null
+++ b/ios/web_view/internal/translate/cwv_translation_controller_internal.h
@@ -0,0 +1,29 @@
+// Copyright 2017 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 IOS_WEB_VIEW_INTERNAL_TRANSLATE_CWV_TRANSLATION_CONTROLLER_INTERNAL_H
+#define IOS_WEB_VIEW_INTERNAL_TRANSLATE_CWV_TRANSLATION_CONTROLLER_INTERNAL_H
+
+#import "ios/web_view/public/cwv_translation_controller.h"
+
+#include "components/translate/core/browser/translate_step.h"
+#include "components/translate/core/common/translate_errors.h"
+#import "ios/web_view/internal/translate/web_view_translate_client.h"
+
+// Some internal methods needed to hide any C++ details.
+@interface CWVTranslationController ()
+
+- (instancetype)initWithWebViewTranslateClient:
+    (ios_web_view::WebViewTranslateClient*)translateClient
+    NS_DESIGNATED_INITIALIZER;
+
+- (void)updateTranslateStep:(translate::TranslateStep)step
+             sourceLanguage:(const std::string&)sourceLanguage
+             targetLanguage:(const std::string&)targetLanguage
+                  errorType:(translate::TranslateErrors::Type)errorType
+          triggeredFromMenu:(bool)triggeredFromMenu;
+
+@end
+
+#endif  // IOS_WEB_VIEW_INTERNAL_TRANSLATE_CWV_TRANSLATION_CONTROLLER_INTERNAL_H