Extend TwoClientExtensionSettingsSyncTest to test app settings.

chrome/browser/sync/test/integration/extensions_helper.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_SYNC_TEST_INTEGRATION_EXTENSIONS_HELPER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_EXTENSIONS_HELPER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 14 matching lines @@
 // as the verifier.
 bool AllProfilesHaveSameExtensionsAsVerifier() WARN_UNUSED_RESULT;
 
 // Returns true iff all existing profiles have the same extensions.
 bool AllProfilesHaveSameExtensions() WARN_UNUSED_RESULT;
 
 // Installs the extension for the given index to |profile|, and returns the
 // extension ID of the new extension.
 std::string InstallExtension(Profile* profile, int index);
 
+// Installs the extension for the given index to all profiles (including the
+// verifier), and returns the extension ID of the new extension.
+std::string InstallExtensionForAllProfiles(int index);
+
 // Uninstalls the extension for the given index from |profile|. Assumes that
 // it was previously installed.
 void UninstallExtension(Profile* profile, int index);
 
 // Returns a vector containing the indices of all currently installed
 // test extensions on |profile|.
 std::vector<int> GetInstalledExtensions(Profile* profile);
 
 // Installs all pending synced extensions for |profile|.
 void InstallExtensionsPendingForSync(Profile* profile);
@@ skipping 20 matching lines @@
 // Returns a unique extension name based in the integer |index|.
 std::string CreateFakeExtensionName(int index);
 
 // Converts a fake extension name back into the index used to generate it.
 // Returns true if successful, false on failure.
 bool ExtensionNameToIndex(const std::string& name, int* index);
 
 }  // namespace extensions_helper
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_EXTENSIONS_HELPER_H_