Add WebstoreInlineInstaller (downloads store data, shows the install UI, and starts the install).

chrome/common/extensions/extension_constants.h

 // Copyright (c) 2011 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_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 263 matching lines @@
   // slash. Do not use this as a prefix/extent for the store.  Instead see
   // ExtensionService::GetWebStoreApp or
   // ExtensionService::IsDownloadFromGallery
   std::string GetWebstoreLaunchURL();
 
   // Returns the URL prefix for an item in the extension/app gallery. This URL
   // will contain a trailing slash and should be concatenated with an item ID
   // to get the item detail URL.
   std::string GetWebstoreItemDetailURLPrefix();
 
+  // Returns the URL used to get webstore data (ratings, manifest, icon URL,
+  // etc.) about an extension from the webstore as JSON.
+  GURL GetWebstoreItemJsonDataURL(const std::string& extension_id);
+
   // Return the update URL used by gallery/webstore extensions/apps. The
   // |secure| parameter will be ignored if the update URL is overriden with
   // --apps-gallery-update-url.
   GURL GetWebstoreUpdateUrl(bool secure);
 
   // Return the URL for an extension/app's .crx file that is hosted by the
   // webstore.
   GURL GetWebstoreInstallUrl(const std::string& extension_id,
                              const std::string& locale);
 
@@ skipping 145 matching lines @@
   };
 
   enum UnloadedExtensionReason {
     UNLOAD_REASON_DISABLE,    // Extension is being disabled.
     UNLOAD_REASON_UPDATE,     // Extension is being updated to a newer version.
     UNLOAD_REASON_UNINSTALL,  // Extension is being uninstalled.
   };
 } // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_