Move ExtensionActionStorageManager out of extension_action_api.*

chrome/browser/extensions/extension_action_storage_manager.h

+// Copyright 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_EXTENSION_ACTION_STORAGE_MANAGER_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_STORAGE_MANAGER_H_
+
+#include <string>
+
+#include "base/memory/weak_ptr.h"
+#include "base/scoped_observer.h"
+#include "chrome/browser/extensions/api/extension_action/extension_action_api.h"
+#include "extensions/browser/extension_registry_observer.h"
+
+class ExtensionAction;
+
+namespace content {
+class BrowserContext;
+}
+
+namespace extensions {
+class ExtensionRegistry;
+class StateStore;
+
+// This class manages reading and writing browser action values from storage.
+class ExtensionActionStorageManager : public ExtensionActionAPI::Observer,
+                                      public ExtensionRegistryObserver {
+ public:
+  explicit ExtensionActionStorageManager(content::BrowserContext* context);
+  virtual ~ExtensionActionStorageManager();
+
+ private:
+  // ExtensionActionAPI::Observer:
+  virtual void OnExtensionActionUpdated(
+      ExtensionAction* extension_action,
+      content::WebContents* web_contents,
+      content::BrowserContext* browser_context) OVERRIDE;
+  virtual void OnExtensionActionAPIShuttingDown() OVERRIDE;
+
+  // ExtensionRegistryObserver:
+  virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
+                                 const Extension* extension) OVERRIDE;
+
+  // Reads/Writes the ExtensionAction's default values to/from storage.
+  void WriteToStorage(ExtensionAction* extension_action);
+  void ReadFromStorage(
+      const std::string& extension_id, scoped_ptr<base::Value> value);
+
+  // Returns the Extensions StateStore for the |browser_context_|.
+  // May return NULL.
+  StateStore* GetStateStore();
+
+  content::BrowserContext* browser_context_;
+
+  ScopedObserver<ExtensionActionAPI, ExtensionActionAPI::Observer>
+      extension_action_observer_;
+
+  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
+      extension_registry_observer_;
+
+  base::WeakPtrFactory<ExtensionActionStorageManager> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionActionStorageManager);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_STORAGE_MANAGER_H_