Ensure we properly set PageTransition for iframes.

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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
@@ skipping 1650 matching lines @@
   Navigate(common_params, StartNavigationParams(), RequestNavigationParams());
 }
 
 void RenderFrameHostImpl::OpenURL(const FrameHostMsg_OpenURL_Params& params,
                                   SiteInstance* source_site_instance) {
   GURL validated_url(params.url);
   GetProcess()->FilterURL(false, &validated_url);
 
   TRACE_EVENT1("navigation", "RenderFrameHostImpl::OpenURL", "url",
                validated_url.possibly_invalid_spec());
+  ui::PageTransition transition = ui::PAGE_TRANSITION_LINK;
+  if (frame_tree_node_->parent()) {
+    transition = params.should_replace_current_entry
+                     ? ui::PAGE_TRANSITION_AUTO_SUBFRAME
+                     : ui::PAGE_TRANSITION_MANUAL_SUBFRAME;
+  }
   frame_tree_node_->navigator()->RequestOpenURL(
-      this, validated_url, source_site_instance, params.referrer,
+      this, validated_url, source_site_instance, params.referrer, transition,
       params.disposition, params.should_replace_current_entry,
       params.user_gesture);
 }
 
 void RenderFrameHostImpl::Stop() {
   Send(new FrameMsg_Stop(routing_id_));
 }
 
 void RenderFrameHostImpl::DispatchBeforeUnload(bool for_navigation) {
   // TODO(creis): Support beforeunload on subframes.  For now just pretend that
@@ skipping 371 matching lines @@
     return;
 
   permission_manager->RegisterPermissionUsage(
       PermissionType::GEOLOCATION,
       GetLastCommittedURL().GetOrigin(),
       frame_tree_node()->frame_tree()->GetMainFrame()
           ->GetLastCommittedURL().GetOrigin());
 }
 
 }  // namespace content