Add a function to send scripts from a browsertest to an extension's background page.

chrome/browser/extensions/extension_browsertest.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_EXTENSION_BROWSERTEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_
 
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 212 matching lines @@
   // navigation.
   void NavigateInRenderer(content::WebContents* contents, const GURL& url);
 
   // Looks for an ExtensionHost whose URL has the given path component
   // (including leading slash).  Also verifies that the expected number of hosts
   // are loaded.
   extensions::ExtensionHost* FindHostWithPath(ExtensionProcessManager* manager,
                                               const std::string& path,
                                               int expected_hosts);
 
+  // Returns
+  // extensions::browsertest_util::ExecuteScriptInBackgroundPage(profile(),
+  // extension_id, script).
+  std::string ExecuteScriptInBackgroundPage(const std::string& extension_id,
+                                            const std::string& script);
+
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   bool loaded_;
   bool installed_;
 
   // test_data/extensions.
   base::FilePath test_data_dir_;
@@ skipping 58 matching lines @@
 
   // Disable external install UI.
   extensions::FeatureSwitch::ScopedOverride
       override_prompt_for_external_extensions_;
 
   // The default profile to be used.
   Profile* profile_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_