[Extensions Bindings] Introduce a supportsLazyListeners property

extensions/renderer/dispatcher.cc

 // Copyright 2014 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 "extensions/renderer/dispatcher.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 197 matching lines @@
 // Sends a notification to the browser that an event either has or no longer has
 // listeners associated with it. Note that we only do this for the first added/
 // last removed listener, rather than for each subsequent listener; the browser
 // only cares if an event has >0 associated listeners.
 // TODO(devlin): Use this in EventBindings, too, and add logic for lazy
 // background pages.
 void SendEventListenersIPC(binding::EventListenersChanged changed,
                            ScriptContext* context,
                            const std::string& event_name,
                            const base::DictionaryValue* filter,
-                           bool was_manual) {
-  bool lazy = ExtensionFrameHelper::IsContextForEventPage(context);
+                           bool update_lazy_listeners) {
+  bool is_lazy = update_lazy_listeners &&
+                 ExtensionFrameHelper::IsContextForEventPage(context);
   // TODO(lazyboy): For service workers, use worker specific IPC::Sender
   // instead of |render_thread|.
   const int worker_thread_id = content::WorkerThread::GetCurrentId();
   std::string extension_id = context->GetExtensionID();
   content::RenderThread* render_thread = content::RenderThread::Get();
 
   if (filter) {
     if (changed == binding::EventListenersChanged::HAS_LISTENERS) {
       render_thread->Send(new ExtensionHostMsg_AddFilteredListener(
-          extension_id, event_name, *filter, lazy));
+          extension_id, event_name, *filter, is_lazy));
     } else {
       DCHECK_EQ(binding::EventListenersChanged::NO_LISTENERS, changed);
       render_thread->Send(new ExtensionHostMsg_RemoveFilteredListener(
-          extension_id, event_name, *filter, lazy));
+          extension_id, event_name, *filter, is_lazy));
     }
   } else {
     if (changed == binding::EventListenersChanged::HAS_LISTENERS) {
       render_thread->Send(new ExtensionHostMsg_AddListener(
           extension_id, context->url(), event_name, worker_thread_id));
-      if (lazy) {
+      if (is_lazy) {
         render_thread->Send(
             new ExtensionHostMsg_AddLazyListener(extension_id, event_name));
       }
     } else {
       DCHECK_EQ(binding::EventListenersChanged::NO_LISTENERS, changed);
       render_thread->Send(new ExtensionHostMsg_RemoveListener(
           extension_id, context->url(), event_name, worker_thread_id));
-      if (lazy && was_manual) {
+      if (is_lazy) {
         render_thread->Send(
             new ExtensionHostMsg_RemoveLazyListener(extension_id, event_name));
       }
     }
   }
 }
 
 base::LazyInstance<WorkerScriptContextSet>::DestructorAtExit
     g_worker_script_context_set = LAZY_INSTANCE_INITIALIZER;
 
@@ skipping 1234 matching lines @@
   // The "guestViewDeny" module must always be loaded last. It registers
   // error-providing custom elements for the GuestView types that are not
   // available, and thus all of those types must have been checked and loaded
   // (or not loaded) beforehand.
   if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
     module_system->Require("guestViewDeny");
   }
 }
 
 }  // namespace extensions