Move SystemLogsSource class into new file

chrome/browser/feedback/system_logs/system_logs_source.h

+// Copyright 2017 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_SOURCE_H_
+#define CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_SOURCE_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "components/feedback/feedback_common.h"
+
+namespace system_logs {
+
+using SystemLogsResponse = FeedbackCommon::SystemLogsMap;
+
+// Callback that the data sources use to return data.
+using SysLogsSourceCallback = base::Callback<void(SystemLogsResponse*)>;
+
+// The SystemLogsSource provides an interface for the data sources that
+// the SystemLogsFetcher class uses to fetch logs and other information.
+class SystemLogsSource {
+ public:
+  // |source_name| provides a descriptive identifier for debugging.
+  explicit SystemLogsSource(const std::string& source_name);
+  virtual ~SystemLogsSource();
+
+  // Fetches data and passes it by pointer to the callback
+  virtual void Fetch(const SysLogsSourceCallback& callback) = 0;
+
+  const std::string& source_name() const { return source_name_; }
+
+ private:
+  std::string source_name_;
+};
+
+}  // namespace system_logs
+
+#endif  // CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_SOURCE_H_