Unpack theme data from extensions off of UI thread.

chrome/browser/sync/test/integration/sync_integration_test_util.h

 // Copyright 2014 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_SYNC_INTEGRATION_TEST_UTIL_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_INTEGRATION_TEST_UTIL_H_
 
 #include <string>
 
 #include "chrome/browser/sync/test/integration/fake_server_match_status_checker.h"
 #include "chrome/browser/sync/test/integration/single_client_status_change_checker.h"
 #include "components/sync/base/model_type.h"
 
+class Profile;
+
 namespace browser_sync {
 class ProfileSyncService;
 }  // namespace browser_sync
 
+// Sets a custom theme and wait until the asynchronous process is done.
+void SetCustomTheme(Profile* profile, int theme_index = 0);
+
 // Checker to block until the server has a given number of entities.
 class ServerCountMatchStatusChecker
     : public fake_server::FakeServerMatchStatusChecker {
  public:
   ServerCountMatchStatusChecker(syncer::ModelType type, size_t count);
 
   // StatusChangeChecker implementation.
   bool IsExitConditionSatisfied() override;
   std::string GetDebugMessage() const override;
 
@@ skipping 16 matching lines @@
 class PassphraseAcceptedChecker : public SingleClientStatusChangeChecker {
  public:
   explicit PassphraseAcceptedChecker(browser_sync::ProfileSyncService* service);
 
   // StatusChangeChecker implementation.
   bool IsExitConditionSatisfied() override;
   std::string GetDebugMessage() const override;
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_INTEGRATION_TEST_UTIL_H_