Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

content/browser/loader/navigation_resource_throttle.cc

Index: content/browser/loader/navigation_resource_throttle.cc
diff --git a/content/browser/loader/navigation_resource_throttle.cc b/content/browser/loader/navigation_resource_throttle.cc
index 6a7f6b6688ed16a84c9d65a217ecfba6a8e24d05..d637bc8c755d633a5bc9c6463d1ff9da19b42583 100644
--- a/content/browser/loader/navigation_resource_throttle.cc
+++ b/content/browser/loader/navigation_resource_throttle.cc
@@ -350,6 +350,15 @@ void NavigationResourceThrottle::OnUIChecksPerformed(
     Cancel();
   } else if (result == NavigationThrottle::BLOCK_REQUEST) {
     CancelWithError(net::ERR_BLOCKED_BY_CLIENT);
+  } else if (result == NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE) {
+    int render_process_id, render_frame_id;
+    if (ResourceRequestInfo::ForRequest(request_)->GetAssociatedRenderFrame(
+            &render_process_id, &render_frame_id)) {
+      RenderFrameHostImpl* render_frame_host =
+          RenderFrameHostImpl::FromID(render_process_id, render_frame_id);
+      render_frame_host->frame_tree_node()->SetFrameOwnerCollapsedState(true);
+    }
+    CancelWithError(net::ERR_BLOCKED_BY_CLIENT);
   } else if (result == NavigationThrottle::BLOCK_RESPONSE) {
     // TODO(mkwst): If we cancel the main frame request with anything other than
     // 'net::ERR_ABORTED', we'll trigger some special behavior that might not be