Pass user session type to extension feature checks

extensions/common/features/feature.h

Index: extensions/common/features/feature.h
diff --git a/extensions/common/features/feature.h b/extensions/common/features/feature.h
index a570b9a93f7f62db0bd4cf2880551303635fdf03..b889ef8d53913274a9740de383d47952d2095de6 100644
--- a/extensions/common/features/feature.h
+++ b/extensions/common/features/feature.h
@@ -53,6 +53,19 @@ class Feature {
     SERVICE_WORKER_CONTEXT,
   };
 
+  // Classes of session types to which features can be restricted in feature
+  // files. The session type describes session based on the type of user that is
+  // active in the current session.
+  enum SessionType {
+    SESSION_TYPE_UNSPECIFIED,
+    // Regular session, i.e. non kiosk app.
+    SESSION_TYPE_REGULAR,
+    // Kiosk app session.
+    SESSION_TYPE_KIOSK,
+    // Helper for determining max enum value - not used as a real type.
+    SESSION_TYPE_MAX = SESSION_TYPE_KIOSK
+  };
+
   // The platforms the feature is supported in.
   enum Platform {
     UNSPECIFIED_PLATFORM,
@@ -136,11 +149,14 @@ class Feature {
   // extension and context.
   Availability IsAvailableToContext(const Extension* extension,
                                     Context context,
+                                    SessionType session_type,
                                     const GURL& url) const {
-    return IsAvailableToContext(extension, context, url, GetCurrentPlatform());
+    return IsAvailableToContext(extension, context, session_type, url,
+                                GetCurrentPlatform());
   }
   virtual Availability IsAvailableToContext(const Extension* extension,
                                             Context context,
+                                            SessionType session_type,
                                             const GURL& url,
                                             Platform platform) const = 0;