Add a private API method to install a webstore app from Files.app

chrome/browser/chromeos/extensions/file_manager/private_api_misc.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.
 //
 // This file provides miscellaneous API functions, which don't belong to
 // other files.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MISC_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MISC_H_
 
@@ skipping 79 matching lines @@
   DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.zoom",
                              FILEBROWSERPRIVATE_ZOOM);
 
   ZoomFunction();
 
  protected:
   virtual ~ZoomFunction();
   virtual bool RunImpl() OVERRIDE;
 };
 
+// Implements the chrome.fileBrowserPrivate.installWebstoreItem method.
+class InstallWebstoreItemFunction : public LoggedAsyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.installWebstoreItem",
+                             FILEBROWSERPRIVATE_INSTALLWEBSTOREITEM);
+
+  InstallWebstoreItemFunction();
+
+ protected:
+  virtual ~InstallWebstoreItemFunction();
+  virtual bool RunImpl() OVERRIDE;
+  void OnInstallComplete(bool success, const std::string& error);
+
+ private:
+  std::string webstore_item_id_;
+};
+
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MISC_H_