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

extensions/renderer/guest_view/guest_view_request.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_GUEST_VIEW_REQUEST_H_
 #define EXTENSIONS_RENDERER_GUEST_VIEW_EXTENSIONS_GUEST_VIEW_REQUEST_H_
 
 #include "ipc/ipc_message.h"
 #include "v8/include/v8.h"
 
@@ skipping 74 matching lines @@
                          v8::Isolate* isolate);
   ~GuestViewDetachRequest() override;
 
   void PerformRequest() override;
   void HandleResponse(const IPC::Message& message) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GuestViewDetachRequest);
 };
 
+class GuestViewAttachIframeRequest : public GuestViewRequest {
+ public:
+  GuestViewAttachIframeRequest(GuestViewContainer* container,
+                               int guest_instance_id,
+                               v8::Local<v8::Function> callback,
+                               v8::Isolate* isolate);
+  ~GuestViewAttachIframeRequest() override;
+
+  void PerformRequest() override;
+  void HandleResponse(const IPC::Message& message) override;
+
+ private:
+  const int guest_instance_id_;
+};
+
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_GUEST_VIEW_EXTENSIONS_GUEST_VIEW_CONTAINER_H_