app_shell: Extract extension runtime data from ExtensionService

extensions/browser/extension_registry.cc

 // 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.
 
 #include "extensions/browser/extension_registry.h"
 
 #include "base/strings/string_util.h"
 #include "extensions/browser/extension_registry_factory.h"
+#include "extensions/browser/extension_registry_observer.h"
 
 namespace extensions {
 
 ExtensionRegistry::ExtensionRegistry() {}
 ExtensionRegistry::~ExtensionRegistry() {}
 
 // static
 ExtensionRegistry* ExtensionRegistry::Get(content::BrowserContext* context) {
   return ExtensionRegistryFactory::GetForBrowserContext(context);
 }
 
+void ExtensionRegistry::AddObserver(ExtensionRegistryObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void ExtensionRegistry::RemoveObserver(ExtensionRegistryObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void ExtensionRegistry::TriggerOnUnloaded(const Extension* extension) {
+  DCHECK(!enabled_extensions_.Contains(extension->id()));
+  FOR_EACH_OBSERVER(
+      ExtensionRegistryObserver, observers_, OnExtensionUnloaded(extension));
+}
+
 const Extension* ExtensionRegistry::GetExtensionById(const std::string& id,
                                                      int include_mask) const {
   std::string lowercase_id = StringToLowerASCII(id);
   if (include_mask & ENABLED) {
     const Extension* extension = enabled_extensions_.GetByID(lowercase_id);
     if (extension)
       return extension;
   }
   if (include_mask & DISABLED) {
     const Extension* extension = disabled_extensions_.GetByID(lowercase_id);
@@ skipping 60 matching lines @@
     const ExtensionSet::ModificationCallback& callback) {
   disabled_extensions_.set_modification_callback(callback);
 }
 
 void ExtensionRegistry::Shutdown() {
   // Release references to all Extension objects in the sets.
   ClearAll();
 }
 
 }  // namespace extensions