Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

content/browser/frame_host/render_frame_host_manager.h

 // Copyright 2013 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_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 417 matching lines @@
   // Sends the newly added Content Security Policy header to all the proxies.
   void OnDidAddContentSecurityPolicy(const ContentSecurityPolicyHeader& header);
 
   // Resets Content Security Policy in all the proxies.
   void OnDidResetContentSecurityPolicy();
 
   // Sends updated enforcement of insecure request policy to all frame proxies
   // when the frame changes its setting.
   void OnEnforceInsecureRequestPolicy(blink::WebInsecureRequestPolicy policy);
 
+  // Called when the client changes whether the frame's owner element in the
+  // embedder document should be collapsed, that is, remove from the layout as
+  // if it did not exist. Never called for main frames. Only has an effect for
+  // <iframe> owner elements.
+  void OnDidChangeCollapsedByClientState(bool collapsed);

[nasko, 2017/03/01 20:08:04]

As noted in the other file, I think the "ByClientState" part doesn't add much
meaning to the name and only makes it more confusing.

[engedy, 2017/04/10 14:36:41]

Done.

+
   // Called on a frame to notify it that its out-of-process parent frame
   // changed a property (such as allowFullscreen) on its <iframe> element.
   // Sends updated FrameOwnerProperties to the RenderFrame and to all proxies,
   // skipping the parent process.
   void OnDidUpdateFrameOwnerProperties(const FrameOwnerProperties& properties);
 
   // Send updated origin to all frame proxies when the frame navigates to a new
   // origin.
   void OnDidUpdateOrigin(const url::Origin& origin,
                          bool is_potentially_trustworthy_unique_origin);
@@ skipping 361 matching lines @@
   std::unique_ptr<RenderFrameHostImpl> speculative_render_frame_host_;
 
   base::WeakPtrFactory<RenderFrameHostManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_MANAGER_H_