Implement NavigationThrottle::BLOCK_REQUEST_AND_COLLAPSE.

third_party/WebKit/Source/web/WebRemoteFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebRemoteFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebRemoteFrameImpl.cpp b/third_party/WebKit/Source/web/WebRemoteFrameImpl.cpp
index d9f83262d3de730661f27bbaf56581dfd7af9f13..9f7471ec53221fe8d58173a0ba527bc5c286731d 100644
--- a/third_party/WebKit/Source/web/WebRemoteFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebRemoteFrameImpl.cpp
@@ -135,6 +135,12 @@ bool WebRemoteFrameImpl::HasVerticalScrollbar() const {
   return false;
 }
 
+void WebRemoteFrameImpl::Collapse(bool collapsed) {

[alexmos, 2017/04/11 06:00:30]

Given that this does the same thing as WebLocalFramImpl::Collapse, can we just
implement it once in WebFrame::Collapse, which uses
ToImplBase()->GetFrame()->Owner() to handle both cases?

[engedy, 2017/04/11 08:06:17]

Excellent suggestion, done!

+  DCHECK(GetFrame()->Owner()->IsLocal());
+  HTMLFrameOwnerElement* owner = ToHTMLFrameOwnerElement(GetFrame()->Owner());
+  owner->SetCollapsedByClient(collapsed);
+}
+
 WebView* WebRemoteFrameImpl::View() const {
   if (!GetFrame())
     return nullptr;