Upstream various ios/web utilities and helpers

ios/web/web_state/crw_recurring_task_delegate.h

Index: ios/web/web_state/crw_recurring_task_delegate.h
diff --git a/ios/web/web_state/crw_recurring_task_delegate.h b/ios/web/web_state/crw_recurring_task_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..12d6fd8f2c5ef793e571426a64f72743c72d8966
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+++ b/ios/web/web_state/crw_recurring_task_delegate.h
@@ -0,0 +1,16 @@
+// Copyright 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 IOS_WEB_WEB_STATE_CRW_RECURRING_TASK_DELEGATE_H_
+#define IOS_WEB_WEB_STATE_CRW_RECURRING_TASK_DELEGATE_H_
+
+// A delegate object to run some recurring task.
+@protocol CRWRecurringTaskDelegate
+
+// Runs a recurring task.
+- (void)runRecurringTask;
+
+@end
+
+#endif  // IOS_WEB_WEB_STATE_CRW_RECURRING_TASK_DELEGATE_H_