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diff --git a/components/update_client/task.h b/components/update_client/task.h
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+++ b/components/update_client/task.h
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+// Copyright 2015 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 COMPONENTS_UPDATE_CLIENT_TASK_H_
+#define COMPONENTS_UPDATE_CLIENT_TASK_H_
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/update_client/update_client.h"
+
+namespace update_client {
+
+class Task;
+
+// Defines an abstraction for a unit of work done by the update client.
+// Each invocation of the update client API results in a task being created and
+// run. In most cases, a task corresponds to a set of CRXs, which are updated
+// together.
+class Task {
+ public:
+  using Callback = base::Callback<void(Task* task, int error)>;
+  virtual ~Task() {}
+
+  virtual void Run(const Callback& callback) = 0;
+};
+
+}  // namespace update_client
+
+#endif  // COMPONENTS_UPDATE_CLIENT_TASK_H_