Expose RenderFrameHost::GetLastCommittedOrigin().

content/browser/frame_host/render_frame_host_impl.cc

 // 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.
 
 #include "content/browser/frame_host/render_frame_host_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 295 matching lines @@
   if (!parent_node)
     return false;
   return GetSiteInstance() !=
       parent_node->current_frame_host()->GetSiteInstance();
 }
 
 GURL RenderFrameHostImpl::GetLastCommittedURL() {
   return frame_tree_node_->current_url();
 }
 
+url::Origin RenderFrameHostImpl::GetLastCommittedOrigin() {
+  // Origin is stored per-FTN, so it's incorrect to call for a non-current RFH.
+  if (this != frame_tree_node_->current_frame_host()) {
+    NOTREACHED() << "Origin information is tracked only for the current host.";
+    return url::Origin();

[Charlie Reis, 2015/11/24 21:00:42]

Sanity check: Since there aren't callers yet, do we want to go further and
enforce this with a CHECK?  Returning an empty Origin as a fallback seems kind
of safe (certainly better than returning some other frame's origin), but I'm not
sure what implications it will have in practice.

[ncarter (slow), 2015/11/24 22:07:33]

Switched to a CHECK based on our face-to-face discussion. This is the sort of
case that makes me wish we had an UMA-logged NOTREACHED().

+  }
+  return frame_tree_node_->current_origin();
+}
+
 gfx::NativeView RenderFrameHostImpl::GetNativeView() {
   RenderWidgetHostView* view = render_view_host_->GetWidget()->GetView();
   if (!view)
     return NULL;
   return view->GetNativeView();
 }
 
 void RenderFrameHostImpl::AddMessageToConsole(ConsoleMessageLevel level,
                                               const std::string& message) {
   Send(new FrameMsg_AddMessageToConsole(routing_id_, level, message));
@@ skipping 2048 matching lines @@
   *dst = src;
 
   if (src.routing_id != -1)
     dst->tree_id = RoutingIDToAXTreeID(src.routing_id);
 
   if (src.parent_routing_id != -1)
     dst->parent_tree_id = RoutingIDToAXTreeID(src.parent_routing_id);
 }
 
 }  // namespace content