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

content/public/browser/web_contents.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 132 matching lines @@
 
   // Returns a WebContents that wraps the RenderViewHost, or nullptr if the
   // render view host's delegate isn't a WebContents.
   CONTENT_EXPORT static WebContents* FromRenderViewHost(
       const RenderViewHost* rvh);
 
   CONTENT_EXPORT static WebContents* FromRenderFrameHost(RenderFrameHost* rfh);
 
   ~WebContents() override {}
 
+  // Attaches or associates a local frame denoted by
+  // |embedder_local_render_frame_id| in |owner_web_contents| to this
+  // WebContents.
+  virtual int AttachLocalFrameToGuest(WebContents* owner_web_contents,
+                                      int embedder_local_render_frame_id,
+                                      int guest_instance_id) = 0;
+
+
   // Intrinsic tab state -------------------------------------------------------
 
   // Gets/Sets the delegate.
   virtual WebContentsDelegate* GetDelegate() = 0;
   virtual void SetDelegate(WebContentsDelegate* delegate) = 0;
 
   // Gets the controller for this WebContents.
   virtual NavigationController& GetController() = 0;
   virtual const NavigationController& GetController() const = 0;
 
@@ skipping 455 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_