Ignore Portals when hittesting.

Bug: 932581
Change-Id: I4375e6e16a1796aec738ae5457bbde54a961e276
Reviewed-on: https://chromium-review.googlesource.com/c/1476091
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Lucas Gadani <lfg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633453}

third_party/blink/renderer/core/frame/remote_frame.cc

@@ -219,8 +219,9 @@ bool RemoteFrame::IsIgnoredForHitTest() const {
   HTMLFrameOwnerElement* owner = DeprecatedLocalOwner();
   if (!owner || !owner->GetLayoutObject())
     return false;
-  return owner->GetLayoutObject()->Style()->PointerEvents() ==
-         EPointerEvents::kNone;
+  return owner->OwnerType() == FrameOwnerElementType::kPortal ||
+         (owner->GetLayoutObject()->Style()->PointerEvents() ==
+          EPointerEvents::kNone);
 }
 
 void RemoteFrame::SetCcLayer(cc::Layer* cc_layer,