Refactor the UpdateEngine and its actions in the component updater.

components/update_client/action_wait.cc

-// 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.
-
-#include "components/update_client/action_wait.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/location.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "components/update_client/update_client_errors.h"
-#include "components/update_client/update_engine.h"
-
-namespace update_client {
-
-ActionWait::ActionWait(const base::TimeDelta& time_delta)
-    : time_delta_(time_delta) {
-}
-
-ActionWait::~ActionWait() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-}
-
-void ActionWait::Run(UpdateContext* update_context, Callback callback) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(update_context);
-
-  ActionImpl::Run(update_context, callback);
-
-  const bool result = base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
-      FROM_HERE, base::Bind(&ActionWait::WaitComplete, base::Unretained(this)),
-      time_delta_);
-
-  if (!result) {
-    // Move all items pending updates to the |kNoUpdate| state then return the
-    // control flow to the update engine, as the updates in this context are
-    // completed with an error.
-    while (!update_context->queue.empty()) {
-      auto* item = FindUpdateItemById(update_context->queue.front());
-      DCHECK(item);
-      item->error_category = static_cast<int>(ErrorCategory::kServiceError);
-      item->error_code = static_cast<int>(ServiceError::SERVICE_WAIT_FAILED);
-      ChangeItemState(item, CrxUpdateItem::State::kNoUpdate);
-      update_context->queue.pop();
-    }
-    callback.Run(Error::SERVICE_ERROR);
-  }
-
-  NotifyObservers(UpdateClient::Observer::Events::COMPONENT_WAIT,
-                  update_context_->queue.front());
-}
-
-void ActionWait::WaitComplete() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  UpdateCrx();
-}
-
-}  // namespace update_client