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

extensions/browser/event_listener_map.h

Index: extensions/browser/event_listener_map.h
diff --git a/extensions/browser/event_listener_map.h b/extensions/browser/event_listener_map.h
index cd694ac76baf86a8314bbe808a6a0f660506f5e9..ea25ea6b433561dbdd8d8e4954e6f9eb6368eb6a 100644
--- a/extensions/browser/event_listener_map.h
+++ b/extensions/browser/event_listener_map.h
@@ -13,6 +13,7 @@
 
 #include "base/macros.h"
 #include "extensions/common/event_filter.h"
+#include "extensions/common/extension_id.h"
 #include "url/gurl.h"
 
 namespace base {
@@ -58,6 +59,16 @@ class EventListener {
       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();
 
@@ -65,9 +76,14 @@ class EventListener {
 
   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();
 
@@ -82,18 +98,21 @@ class EventListener {
   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.
 
@@ -150,7 +169,10 @@ class EventListenerMap {
   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.