Add ref count to service workers for extension API.

extensions/browser/extension_function.h

Index: extensions/browser/extension_function.h
diff --git a/extensions/browser/extension_function.h b/extensions/browser/extension_function.h
index 40ac407ca5d4a40ed7205e519117c81874a8a5c8..d68d1a8cce3397fe1accbbe695f917210e5af219 100644
--- a/extensions/browser/extension_function.h
+++ b/extensions/browser/extension_function.h
@@ -528,8 +528,8 @@ class UIThreadExtensionFunction : public ExtensionFunction {
     return dispatcher_.get();
   }
 
-  void set_is_from_service_worker(bool value) {
-    is_from_service_worker_ = value;
+  void set_service_worker_version_id(int64_t version_id) {
+    service_worker_version_id_ = version_id;
   }
 
   // Gets the "current" web contents if any. If there is no associated web
@@ -567,15 +567,17 @@ class UIThreadExtensionFunction : public ExtensionFunction {
 
   void Destruct() const override;
 
+  bool IsFromServiceWorker() const;
+
   // The dispatcher that will service this extension function call.
   base::WeakPtr<extensions::ExtensionFunctionDispatcher> dispatcher_;
 
   // The RenderFrameHost we will send responses to.
   content::RenderFrameHost* render_frame_host_;
 
-  // Whether or not this ExtensionFunction was called by an extension Service
-  // Worker.
-  bool is_from_service_worker_;
+  // If this ExtensionFunction was called by an extension Service Worker, then
+  // this contains the worker's version id.
+  int64_t service_worker_version_id_;
 
   std::unique_ptr<RenderFrameHostTracker> tracker_;