Implement gallery install API

chrome/browser/extensions/extension_webstore_private_api.h

 // Copyright (c) 2010 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_WEBSTORE_PRIVATE_API_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBSTORE_PRIVATE_API_H__
 #pragma once
 
 #include "chrome/browser/extensions/extension_function.h"
 
+class InstallFunction : public SyncExtensionFunction {
+ public:
+  static void SetTestingInstallBaseUrl(const char* testing_install_base_url);
+
+ protected:
+  ~InstallFunction() {}
+  virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.install");
+};
+
 class GetSyncLoginFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.getSyncLogin");
 };
 
 class GetStoreLoginFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.getStoreLogin");
 };
 
 class SetStoreLoginFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("webstorePrivate.setStoreLogin");
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEBSTORE_PRIVATE_API_H__