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

extensions/browser/guest_view/extensions_guest_view_message_filter.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_BROWSER_GUEST_VIEW_EXTENSIONS_GUEST_VIEW_MESSAGE_FILTER_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_EXTENSIONS_GUEST_VIEW_MESSAGE_FILTER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/browser_message_filter.h"
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
 namespace gfx {
 class Size;
 }
 
 namespace extensions {
 
+class WebViewGuest;
+
 // This class filters out incoming extensions GuestView-specific IPC messages
 // from thw renderer process. It is created on the UI thread. Messages may be
 // handled on the IO thread or the UI thread.
 class ExtensionsGuestViewMessageFilter : public content::BrowserMessageFilter {
  public:
   ExtensionsGuestViewMessageFilter(int render_process_id,
                                    content::BrowserContext* context);
 
  private:
   friend class content::BrowserThread;
   friend class base::DeleteHelper<ExtensionsGuestViewMessageFilter>;
 
   ~ExtensionsGuestViewMessageFilter() override;
 
   // content::BrowserMessageFilter implementation.
   void OverrideThreadForMessage(const IPC::Message& message,
                                 content::BrowserThread::ID* thread) override;
   void OnDestruct() const override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // Message handlers on the UI thread.
+  void OnAttachToEmbedderFrame(int embedder_local_render_frame_id,
+                               int element_instance_id,
+                               int guest_instance_id,
+                               const base::DictionaryValue& params);
   void OnCanExecuteContentScript(int render_view_id,
                                  int script_id,
                                  bool* allowed);
 
   void OnCreateMimeHandlerViewGuest(int render_frame_id,
                                     const std::string& view_id,
                                     int element_instance_id,
                                     const gfx::Size& element_size);
   void OnResizeGuest(int render_frame_id,
                      int element_instance_id,
                      const gfx::Size& new_size);
 
   // Runs on UI thread.
   void MimeHandlerViewGuestCreatedCallback(int element_instance_id,
                                            int embedder_render_process_id,
                                            int embedder_render_frame_id,
                                            const gfx::Size& element_size,
                                            content::WebContents* web_contents);
+  void WillAttachCallback(extensions::WebViewGuest* guest);
 
   const int render_process_id_;
 
   // Should only be accessed on the UI thread.
   content::BrowserContext* const browser_context_;
 
   // Weak pointers produced by this factory are bound to the IO thread.
   base::WeakPtrFactory<ExtensionsGuestViewMessageFilter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsGuestViewMessageFilter);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_EXTENSIONS_GUEST_VIEW_MESSAGE_FILTER_H_