Move some of c/b/feedback/system_logs to //components/feedback

chrome/browser/feedback/system_logs/system_logs_fetcher.h

-// Copyright 2013 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_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_FETCHER_H_
-#define CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_FETCHER_H_
-
-#include <stddef.h>
-
-#include <map>
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "chrome/browser/feedback/system_logs/system_logs_source.h"
-#include "components/feedback/anonymizer_tool.h"
-#include "components/feedback/feedback_common.h"
-
-namespace system_logs {
-
-// Callback that the SystemLogsFetcher uses to return data.
-using SysLogsFetcherCallback =
-    base::Callback<void(std::unique_ptr<SystemLogsResponse>)>;
-
-// The SystemLogsFetcher fetches key-value data from a list of log sources.
-//
-// EXAMPLE:
-// class Example {
-//  public:
-//   void ProcessLogs(SystemLogsResponse* response) {
-//      // do something with the logs
-//   }
-//   void GetLogs() {
-//     SystemLogsFetcher* fetcher = new SystemLogsFetcher(/*scrub_data=*/ true);
-//     fetcher->AddSource(base::MakeUnique<LogSourceOne>());
-//     fetcher->AddSource(base::MakeUnique<LogSourceTwo>());
-//     fetcher->Fetch(base::Bind(&Example::ProcessLogs, this));
-//   }
-// };
-class SystemLogsFetcher {
- public:
-  // If scrub_data is true, logs will be anonymized.
-  // TODO(battre): This class needs to be expanded to provide better scrubbing
-  // of system logs.
-  explicit SystemLogsFetcher(bool scrub_data);
-  ~SystemLogsFetcher();
-
-  // Adds a source to use when fetching.
-  void AddSource(std::unique_ptr<SystemLogsSource> source);
-
-  // Starts the fetch process.
-  void Fetch(const SysLogsFetcherCallback& callback);
-
- private:
-  // Callback passed to all the data sources. May call Scrub(), then calls
-  // AddResponse().
-  void OnFetched(const std::string& source_name, SystemLogsResponse* response);
-
-  // Merges the |response| it receives into response_. When all the data sources
-  // have responded, it deletes their objects and returns the response to the
-  // callback_. After this it deletes this instance of the object.
-  void AddResponse(const std::string& source_name,
-                   SystemLogsResponse* response);
-
-  std::vector<std::unique_ptr<SystemLogsSource>> data_sources_;
-  SysLogsFetcherCallback callback_;
-
-  std::unique_ptr<SystemLogsResponse> response_;  // The actual response data.
-  size_t num_pending_requests_;  // The number of callbacks it should get.
-
-  std::unique_ptr<feedback::AnonymizerTool> anonymizer_;
-
-  base::WeakPtrFactory<SystemLogsFetcher> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(SystemLogsFetcher);
-};
-
-}  // namespace system_logs
-
-#endif  // CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_FETCHER_H_