Introduced WebFactory and WebFactoryImpl for constructing web/ classes

third_party/WebKit/Source/core/WebFactory.h

+// 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 WebFactory_h
+#define WebFactory_h
+
+#include "core/CoreExport.h"
+#include "public/platform/WebPageVisibilityState.h"
+
+namespace blink {
+
+class ChromeClient;
+class WebViewBase;
+class WebViewClient;
+
+// WebFactory is a temporary class implemented in web/ that allows classes to
+// construct interfaces that are being moved out of web/.
+// This class will be removed once all implementations are in core/ or modules/.
+class CORE_EXPORT WebFactory {
+ public:
+  // Takes ownership of |factory|.
+  static void SetInstance(WebFactory*);
+  static WebFactory& GetInstance();
+
+  virtual ChromeClient* CreateChromeClient(WebViewBase*) const = 0;
+  virtual WebViewBase* CreateWebViewBase(WebViewClient*,
+                                         WebPageVisibilityState) const = 0;
+
+ private:
+  static WebFactory* factory_instance_;
+};
+
+}  // namespace blink
+
+#endif