Allow chromedriver to install an extension and get all installed extension IDs.

chrome/test/webdriver/webdriver_automation.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_TEST_WEBDRIVER_WEBDRIVER_AUTOMATION_H_
 #define CHROME_TEST_WEBDRIVER_WEBDRIVER_AUTOMATION_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 144 matching lines @@
   void GetBrowserVersion(std::string* version);
 
   // Gets the ChromeDriver automation version supported by the automation
   // server.
   void GetChromeDriverAutomationVersion(int* version, Error** error);
 
   // Waits for all tabs to stop loading.
   void WaitForAllTabsToStopLoading(Error** error);
 
   // Install packed extension.
-  void InstallExtension(const FilePath& path, Error** error);
+  void InstallExtensionDeprecated(const FilePath& path, Error** error);
+
+  // Gets all installed extension IDs.
+  void GetInstalledExtensions(std::vector<std::string>* extension_ids,
+                              Error** error);
+
+  // Install a packed or unpacked extension. If the path ends with '.crx',
+  // the extension is assumed to be packed.
+  void InstallExtension(const FilePath& path, std::string* extension_id,
+                        Error** error);
 
  private:
   AutomationProxy* automation() const;
   Error* GetIndicesForTab(int tab_id, int* browser_index, int* tab_index);
   Error* CompareVersion(int client_build_no,
                         int client_patch_no,
                         bool* is_newer_or_equal);
   Error* CheckVersion(int client_build_no,
                       int client_patch_no,
                       const std::string& error_msg);
   Error* CheckAlertsSupported();
   Error* CheckAdvancedInteractionsSupported();
+  Error* CheckNewExtensionInterfaceSupported();
 
   scoped_ptr<ProxyLauncher> launcher_;
 
   DISALLOW_COPY_AND_ASSIGN(Automation);
 };
 
 }  // namespace webdriver
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(webdriver::Automation);
 
 #endif  // CHROME_TEST_WEBDRIVER_WEBDRIVER_AUTOMATION_H_