Make <webview> use out-of-process iframe architecture.

extensions/renderer/guest_view/extensions_iframe_guest_view_container.h

+// Copyright 2015 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 EXTENSIONS_RENDERER_GUEST_VIEW_EXTENSIONS_IFRAME_GUEST_VIEW_CONTAINER_H_
+#define EXTENSIONS_RENDERER_GUEST_VIEW_EXTENSIONS_IFRAME_GUEST_VIEW_CONTAINER_H_
+
+#include "extensions/renderer/guest_view/extensions_guest_view_container.h"
+
+namespace gfx {
+class Size;
+}
+
+namespace extensions {
+
+class ExtensionsIframeGuestViewContainer : public ExtensionsGuestViewContainer {
+ public:
+  explicit ExtensionsIframeGuestViewContainer(
+      content::RenderFrame* render_frame);
+  ~ExtensionsIframeGuestViewContainer() override;
+
+  // GuestViewContainer overrides.
+  bool OnMessage(const IPC::Message& message) override;
+
+ private:
+  // Weak pointer factory used for calling the element resize callback.
+  base::WeakPtrFactory<ExtensionsIframeGuestViewContainer> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionsIframeGuestViewContainer);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_GUEST_VIEW_EXTENSIONS_IFRAME_GUEST_VIEW_CONTAINER_H_