Include referrer chain with inline install requests.

chrome/browser/extensions/webstore_standalone_installer.h

 // Copyright (c) 2012 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_STANDALONE_INSTALLER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_STANDALONE_INSTALLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 73 matching lines @@
   // is safe to call from OnManifestParsed() onwards. The manifest may be
   // invalid, thus the caller must check that the return value is not NULL.
   scoped_refptr<const Extension> GetLocalizedExtensionForDisplay();
 
   // Template Method's hooks to be implemented by subclasses.
 
   // Called when this install is about to be registered with the InstallTracker.
   // Allows subclasses to set properties of the install data.
   virtual void InitInstallData(ActiveInstallData* install_data) const;
 
+  // Gives subclasses an opportunity to provide extra post data in the form of
+  // serialized JSON to the webstore data request before sending. The default
+  // implementation returns an empty string.
+  virtual std::string GetJsonPostData();
+
   // Called at certain check points of the workflow to decide whether it makes
   // sense to proceed with installation. A requestor can be a website that
   // initiated an inline installation, or a command line option.
   virtual bool CheckRequestorAlive() const = 0;
 
   // Requestor's URL, if any. Should be an empty GURL if URL is meaningless
   // (e.g. for a command line option).
   virtual const GURL& GetRequestorURL() const = 0;
 
   // Should a new tab be opened after installation to show the newly installed
@@ skipping 138 matching lines @@
   // Created by ShowInstallUI() when a prompt is shown (if
   // the implementor returns a non-NULL in CreateInstallPrompt()).
   scoped_refptr<Extension> localized_extension_for_display_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebstoreStandaloneInstaller);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_STANDALONE_INSTALLER_H_