Keep track in the browser of which frames have onunload and onbeforeunload handlers.

content/renderer/render_frame_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/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 4738 matching lines @@
 }
 
 void RenderFrameImpl::enterFullscreen() {
   Send(new FrameHostMsg_ToggleFullscreen(routing_id_, true));
 }
 
 void RenderFrameImpl::exitFullscreen() {
   Send(new FrameHostMsg_ToggleFullscreen(routing_id_, false));
 }
 
+void RenderFrameImpl::suddenTerminationDisablerChanged(
+    bool present,
+    blink::WebFrameClient::SuddenTerminationDisablerType type) {
+  switch (type) {
+    case blink::WebFrameClient::BeforeUnloadHandler:
+      Send(new FrameHostMsg_BeforeUnloadHandlersPresent(routing_id_, present));
+      break;
+    case blink::WebFrameClient::UnloadHandler:
+      Send(new FrameHostMsg_UnloadHandlersPresent(routing_id_, present));
+      break;
+    default:

[nasko, 2017/03/29 23:31:26]

Omitting the default: clause should be fine and will allow the compiler to
enforce that all possible enum values are checked in the switch statement.

+      NOTREACHED();
+  }
+}
+
 void RenderFrameImpl::registerProtocolHandler(const WebString& scheme,
                                               const WebURL& url,
                                               const WebString& title) {
   bool user_gesture = WebUserGestureIndicator::isProcessingUserGesture();
   Send(new FrameHostMsg_RegisterProtocolHandler(routing_id_, scheme.utf8(), url,
                                                 title.utf16(), user_gesture));
 }
 
 void RenderFrameImpl::unregisterProtocolHandler(const WebString& scheme,
                                                 const WebURL& url) {
@@ skipping 2200 matching lines @@
       policy(info.defaultPolicy),
       replaces_current_history_item(info.replacesCurrentHistoryItem),
       history_navigation_in_new_child_frame(
           info.isHistoryNavigationInNewChildFrame),
       client_redirect(info.isClientRedirect),
       cache_disabled(info.isCacheDisabled),
       form(info.form),
       source_location(info.sourceLocation) {}
 
 }  // namespace content