Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

content/browser/frame_host/render_frame_host_manager.h

Index: content/browser/frame_host/render_frame_host_manager.h
diff --git a/content/browser/frame_host/render_frame_host_manager.h b/content/browser/frame_host/render_frame_host_manager.h
index 9a7d3ad05e2731212b9050df87f51c47d4ab81b8..a9abdb1946527f16b6c7c12bb8f8b097bae2f378 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -435,6 +435,12 @@ class CONTENT_EXPORT RenderFrameHostManager
   // 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,