Allow the user to "repair" a corrupted extension.

chrome/browser/extensions/webstore_reinstaller.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_WEBSTORE_REINSTALLER_H_
+#define CHROME_BROWSER_EXTENSIONS_WEBSTORE_REINSTALLER_H_
+
+#include "chrome/browser/extensions/webstore_standalone_installer.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace extensions {
+
+// Reinstalls an extension from the webstore. This will first prompt the user if
+// they want to reinstall (using the verbase "Repair", since this is our action
+// for repairing corrupted extensions), and, if the user agrees, will uninstall
+// the extension and reinstall it directly from the webstore.
+class WebstoreReinstaller : public WebstoreStandaloneInstaller,
+                            public content::WebContentsObserver {
+ public:
+  WebstoreReinstaller(content::WebContents* web_contents,
+                      const std::string& extension_id,
+                      const WebstoreStandaloneInstaller::Callback& callback);
+
+  // Begin the reinstall process. |callback| (from the constructor) will be
+  // called upon completion.
+  void BeginReinstall();
+
+ private:
+  virtual ~WebstoreReinstaller();
+
+  // WebstoreStandaloneInstaller:
+  virtual bool CheckRequestorAlive() const OVERRIDE;
+  virtual const GURL& GetRequestorURL() const OVERRIDE;
+  virtual bool ShouldShowPostInstallUI() const OVERRIDE;
+  virtual bool ShouldShowAppInstalledBubble() const OVERRIDE;
+  virtual content::WebContents* GetWebContents() const OVERRIDE;
+  virtual scoped_refptr<ExtensionInstallPrompt::Prompt> CreateInstallPrompt()
+      const OVERRIDE;
+  virtual bool CheckInlineInstallPermitted(
+      const base::DictionaryValue& webstore_data,
+      std::string* error) const OVERRIDE;
+  virtual bool CheckRequestorPermitted(
+      const base::DictionaryValue& webstore_data,
+      std::string* error) const OVERRIDE;
+  virtual void InstallUIProceed() OVERRIDE;
+
+  // content::WebContentsObserver:
+  virtual void WebContentsDestroyed() OVERRIDE;
+
+  // Called once all data from the old extension installation is removed.
+  void OnDeletionDone();
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_REINSTALLER_H_