Declarative content scripts: Browser-side: per-extension shared memory regions (lazily loaded)

chrome/browser/extensions/shared_user_script_master.h

+// Copyright (c) 2014 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 CHROME_BROWSER_EXTENSIONS_SHARED_USER_SCRIPT_MASTER_H_
+#define CHROME_BROWSER_EXTENSIONS_SHARED_USER_SCRIPT_MASTER_H_
+
+#include "base/scoped_observer.h"
+#include "chrome/browser/extensions/user_script_master.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "extensions/browser/extension_registry.h"

[Devlin, 2014/07/30 21:20:38]

Can forward declare this instead.

+#include "extensions/browser/extension_registry_observer.h"
+#include "extensions/common/extension.h"
+
+namespace content {
+
+class BrowserContext;

[Devlin, 2014/07/30 21:20:38]

namespace content {
class BrowserContext;
}

+
+}  // namespace content
+
+class Profile;
+
+namespace extensions {
+
+class SharedUserScriptMaster : public UserScriptMaster,

[Devlin, 2014/07/30 21:20:39]

add class comments

+                               public content::NotificationObserver,
+                               public ExtensionRegistryObserver {
+ public:
+  explicit SharedUserScriptMaster(Profile* profile);
+  virtual ~SharedUserScriptMaster();
+
+  // content::NotificationObserver implementation.

[Devlin, 2014/07/30 21:20:39]

move overloaded methods to private.

+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // ExtensionRegistryObserver implementation.
+  virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
+                                 const Extension* extension) OVERRIDE;
+  virtual void OnExtensionUnloaded(
+      content::BrowserContext* browser_context,
+      const Extension* extension,
+      UnloadedExtensionInfo::Reason reason) OVERRIDE;
+
+  virtual void StartLoad() OVERRIDE;

[Devlin, 2014/07/30 21:20:39]

UserScriptMaster implementation.

+
+ private:
+  // Manages our notification registrations.
+  content::NotificationRegistrar registrar_;
+
+  // Listen to extension load, unloaded notifications.
+  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
+      extension_registry_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(SharedUserScriptMaster);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SHARED_USER_SCRIPT_MASTER_H_