[iOS] Upstream web_controller_provider_impl.{h,mm}.

ios/public/provider/web/web_controller_provider_factory.h

+// Copyright 2016 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_PUBLIC_PROVIDER_WEB_WEB_CONTROLLER_PROVIDER_FACTORY_H_
+#define IOS_PUBLIC_PROVIDER_WEB_WEB_CONTROLLER_PROVIDER_FACTORY_H_
+
+#include <memory>
+
+namespace web {
+class BrowserState;
+}
+
+namespace ios {
+
+class WebControllerProvider;
+
+// Factory for creation of WebControllerProvider instances.
+class WebControllerProviderFactory {
+ public:
+  WebControllerProviderFactory();
+  virtual ~WebControllerProviderFactory();
+
+  // Vends WebControllerProviders created using |browser_state|, passing
+  // ownership to callers.
+  virtual std::unique_ptr<WebControllerProvider> CreateWebControllerProvider(
+      web::BrowserState* browser_state);
+};
+
+// Setter and getter for the provider factory. The provider factory should be
+// set early, before any component using WebControllerProviders is called.
+void SetWebControllerProviderFactory(
+    WebControllerProviderFactory* provider_factory);
+WebControllerProviderFactory* GetWebControllerProviderFactory();
+
+}  // namespace ios
+
+#endif  // IOS_PUBLIC_PROVIDER_WEB_WEB_CONTROLLER_PROVIDER_FACTORY_H_