app_shell: Extract extension runtime data from ExtensionService

extensions/browser/extension_registry.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_
 #define EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
+#include "base/observer_list.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "extensions/common/extension_set.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 class Extension;
+class ExtensionRegistryObserver;
 
 // ExtensionRegistry holds sets of the installed extensions for a given
 // BrowserContext. An incognito browser context and its master browser context
 // share a single registry.
 class ExtensionRegistry : public BrowserContextKeyedService {
  public:
   // Flags to pass to GetExtensionById() to select which sets to look in.
   enum IncludeFlag {
     NONE        = 0,
     ENABLED     = 1 << 0,
@@ skipping 17 matching lines @@
   const ExtensionSet& disabled_extensions() const {
     return disabled_extensions_;
   }
   const ExtensionSet& terminated_extensions() const {
     return terminated_extensions_;
   }
   const ExtensionSet& blacklisted_extensions() const {
     return blacklisted_extensions_;
   }
 
+  // The usual observer interface.
+  void AddObserver(ExtensionRegistryObserver* observer);
+  void RemoveObserver(ExtensionRegistryObserver* observer);
+
+  // Invokes the observer method OnExtensionUnloaded(). The extension must not
+  // be enabled at the time of the call.
+  void TriggerOnUnloaded(const Extension* extension);
+
   // Find an extension by ID using |include_mask| to pick the sets to search:
   //  * enabled_extensions()     --> ExtensionRegistry::ENABLED
   //  * disabled_extensions()    --> ExtensionRegistry::DISABLED
   //  * terminated_extensions()  --> ExtensionRegistry::TERMINATED
   //  * blacklisted_extensions() --> ExtensionRegistry::BLACKLISTED
   // Returns NULL if the extension is not found in the selected sets.
   const Extension* GetExtensionById(const std::string& id,
                                     int include_mask) const;
 
   // Adds the specified extension to the enabled set. The registry becomes an
@@ skipping 42 matching lines @@
 
   // Extensions that are installed and terminated.
   ExtensionSet terminated_extensions_;
 
   // Extensions that are installed and blacklisted. Generally these shouldn't be
   // considered as installed by the extension platform: we only keep them around
   // so that if extensions are blacklisted by mistake they can easily be
   // un-blacklisted.
   ExtensionSet blacklisted_extensions_;
 
+  ObserverList<ExtensionRegistryObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_