[extension SW]: Support event listener registration and event dispatching.

extensions/browser/event_listener_map.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_EVENT_LISTENER_MAP_H_
 #define EXTENSIONS_BROWSER_EVENT_LISTENER_MAP_H_
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "extensions/common/event_filter.h"
+#include "extensions/common/extension_id.h"
 #include "url/gurl.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content {
 class BrowserContext;
 class RenderProcessHost;
 }
@@ skipping 25 matching lines @@
   static std::unique_ptr<EventListener> ForExtension(
       const std::string& event_name,
       const std::string& extension_id,
       content::RenderProcessHost* process,
       std::unique_ptr<base::DictionaryValue> filter);
   static std::unique_ptr<EventListener> ForURL(
       const std::string& event_name,
       const GURL& listener_url,
       content::RenderProcessHost* process,
       std::unique_ptr<base::DictionaryValue> filter);
+  // Constructs EventListener for an Extension service worker.
+  // Similar to ForExtension above with the only difference that
+  // |worker_thread_id_| contains a valid worker thread, as opposed to
+  // kNonWorkerThreadId.
+  static std::unique_ptr<EventListener> ForExtensionServiceWorker(
+      const std::string& event_name,
+      const std::string& extension_id,
+      content::RenderProcessHost* process,
+      int worker_thread_id,
+      std::unique_ptr<base::DictionaryValue> filter);
 
   ~EventListener();
 
   bool Equals(const EventListener* other) const;
 
   std::unique_ptr<EventListener> Copy() const;
 
-  // Returns true in the case of a lazy background page, and thus no process.
+  // Returns true if the listener is for a lazy context: e.g. a background page
+  // or an extension service worker. This listener does not have |process_|.
   bool IsLazy() const;
 
+  // Returns true if this listener was registered for an extension service
+  // worker.
+  bool IsForServiceWorker() const;
+
   // Modifies this listener to be a lazy listener, clearing process references.
   void MakeLazy();
 
   // Returns the browser context associated with the listener, or NULL if
   // IsLazy.
   content::BrowserContext* GetBrowserContext() const;
 
   const std::string& event_name() const { return event_name_; }
   const std::string& extension_id() const { return extension_id_; }
   const GURL& listener_url() const { return listener_url_; }
   content::RenderProcessHost* process() const { return process_; }
   base::DictionaryValue* filter() const { return filter_.get(); }
   EventFilter::MatcherID matcher_id() const { return matcher_id_; }
   void set_matcher_id(EventFilter::MatcherID id) { matcher_id_ = id; }
+  int worker_thread_id() const { return worker_thread_id_; }
 
  private:
   EventListener(const std::string& event_name,
                 const std::string& extension_id,
                 const GURL& listener_url,
                 content::RenderProcessHost* process,
+                int worker_thread_id,
                 std::unique_ptr<base::DictionaryValue> filter);
 
   const std::string event_name_;
   const std::string extension_id_;
   const GURL listener_url_;
   content::RenderProcessHost* process_;
+  const int worker_thread_id_;
   std::unique_ptr<base::DictionaryValue> filter_;
   EventFilter::MatcherID matcher_id_;  // -1 if unset.
 
   DISALLOW_COPY_AND_ASSIGN(EventListener);
 };
 
 // Holds listeners for extension events and can answer questions about which
 // listeners are interested in what events.
 class EventListenerMap {
  public:
@@ skipping 36 matching lines @@
   // Returns true if there are any listeners on |event_name| from
   // |extension_id|.
   bool HasListenerForExtension(const std::string& extension_id,
                                const std::string& event_name) const;
 
   // Returns true if this map contains an EventListener that .Equals()
   // |listener|.
   bool HasListener(const EventListener* listener) const;
 
   // Returns true if there is a listener for |extension_id| in |process|.
+  // |worker_thread_id| is the thread id of the service worker the listener is
+  // for, or kNonWorkerThreadId if the listener is not for a service worker.
   bool HasProcessListener(content::RenderProcessHost* process,
+                          int worker_thread_id,
                           const std::string& extension_id) const;
 
   // Removes any listeners that |extension_id| has added, both lazy and regular.
   void RemoveListenersForExtension(const std::string& extension_id);
 
   // Adds unfiltered lazy listeners as described their serialised descriptions.
   // |event_names| the names of the lazy events.
   // Note that we can only load lazy listeners in this fashion, because there
   // is no way to serialise a RenderProcessHost*.
   void LoadUnfilteredLazyListeners(const std::string& extension_id,
@@ skipping 24 matching lines @@
   std::map<EventFilter::MatcherID, EventListener*> listeners_by_matcher_id_;
 
   EventFilter event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(EventListenerMap);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EVENT_LISTENER_MAP_H_