[Reland][Extensions Bindings] Add support for filtered events

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 188 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) {
-  if (changed == binding::EventListenersChanged::HAS_LISTENERS) {
-    content::RenderThread::Get()->Send(new ExtensionHostMsg_AddListener(
-        context->GetExtensionID(), context->url(), event_name));
+                           const std::string& event_name,
+                           const base::DictionaryValue* filter) {
+  // TODO(devlin): Fix this. We need to account for lazy listeners, but it
+  // also depends on if the listener is removed due to the context being torn
+  // down or the extension unregistering.
+  bool lazy = false;
+  std::string extension_id = context->GetExtensionID();
+
+  if (filter) {
+    if (changed == binding::EventListenersChanged::HAS_LISTENERS) {
+      content::RenderThread::Get()->Send(
+          new ExtensionHostMsg_AddFilteredListener(extension_id, event_name,
+                                                   *filter, lazy));
+    } else {
+      DCHECK_EQ(binding::EventListenersChanged::NO_LISTENERS, changed);
+      content::RenderThread::Get()->Send(
+          new ExtensionHostMsg_RemoveFilteredListener(extension_id, event_name,
+                                                      *filter, lazy));
+    }
   } else {
-    DCHECK_EQ(binding::EventListenersChanged::NO_LISTENERS, changed);
-    content::RenderThread::Get()->Send(new ExtensionHostMsg_RemoveListener(
-        context->GetExtensionID(), context->url(), event_name));
+    if (changed == binding::EventListenersChanged::HAS_LISTENERS) {
+      content::RenderThread::Get()->Send(new ExtensionHostMsg_AddListener(
+          context->GetExtensionID(), context->url(), event_name));
+    } else {
+      DCHECK_EQ(binding::EventListenersChanged::NO_LISTENERS, changed);
+      content::RenderThread::Get()->Send(new ExtensionHostMsg_RemoveListener(
+          context->GetExtensionID(), context->url(), event_name));
+    }
   }
 }
 
 base::LazyInstance<WorkerScriptContextSet>::DestructorAtExit
     g_worker_script_context_set = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 // Note that we can't use Blink public APIs in the constructor becase Blink
 // is not initialized at the point we create Dispatcher.
@@ skipping 1192 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