Convert tabs, windows, and extension APIs to feature system.

chrome/browser/extensions/extension_event_router.h

Index: chrome/browser/extensions/extension_event_router.h
diff --git a/chrome/browser/extensions/extension_event_router.h b/chrome/browser/extensions/extension_event_router.h
index 2b52cc812bae9e6b4526fa6f8307338eb1525cf7..a08d816fdb14cdd8d90f90fa8476f5a93507bb90 100644
--- a/chrome/browser/extensions/extension_event_router.h
+++ b/chrome/browser/extensions/extension_event_router.h
@@ -15,6 +15,7 @@
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "chrome/common/extensions/feature.h"
 #include "ipc/ipc_message.h"
 
 class GURL;
@@ -23,6 +24,8 @@ class ExtensionHost;
 class ExtensionDevToolsManager;
 class Profile;
 
+using extensions::Feature;
+
 namespace content {
 class RenderProcessHost;
 }
@@ -54,8 +57,9 @@ class ExtensionEventRouter : public content::NotificationObserver {
   // collapsing. Also, a single extension can have 2 processes if it is a split
   // mode extension.
   void AddEventListener(const std::string& event_name,
+                        const std::string& extension_id,
                         content::RenderProcessHost* process,
-                        const std::string& extension_id);
+                        Feature::Context context);
   void RemoveEventListener(const std::string& event_name,
                            content::RenderProcessHost* process,
                            const std::string& extension_id);
@@ -65,6 +69,12 @@ class ExtensionEventRouter : public content::NotificationObserver {
   // remembered even after the process goes away. We use this list to decide
   // which extension pages to load when dispatching an event.
   void AddLazyEventListener(const std::string& event_name,
+                            const std::string& extension_id,
+                            content::RenderProcessHost* process,
+                            Feature::Context context);
+  // Use this overload when subscribing extensions to events from C++, or when
+  // access checking the calling process and context is not required.
+  void AddLazyEventListener(const std::string& event_name,
                             const std::string& extension_id);
   void RemoveLazyEventListener(const std::string& event_name,
                                const std::string& extension_id);
@@ -131,6 +141,12 @@ class ExtensionEventRouter : public content::NotificationObserver {
   // event.
   struct ListenerProcess;
 
+  // Helper that returns whether the event is accessible to the calling context.
+  bool IsEventAvailable(const std::string& event_name,
+                        const std::string& extension_id,
+                        content::RenderProcessHost* render_process,
+                        Feature::Context context_type) const;
+
   // A map between an event name and a set of extensions that are listening
   // to that event.
   typedef std::map<std::string, std::set<ListenerProcess> > ListenerMap;