Add new API function: feedbackPrivate.readLogSource

chrome/browser/extensions/api/feedback_private/single_log_source_factory.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_EXTENSIONS_API_FEEDBACK_PRIVATE_SINGLE_LOG_SOURCE_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_API_FEEDBACK_PRIVATE_SINGLE_LOG_SOURCE_FACTORY_H_
+
+#include <memory>
+
+#include "base/callback.h"
+#include "chrome/browser/chromeos/system_logs/single_log_source.h"
+
+namespace extensions {
+
+// Provides a way to override the creation of a new SingleLogSource during
+// testing.
+class SingleLogSourceFactory {
+ public:
+  using CreateCallback =
+      base::Callback<std::unique_ptr<system_logs::SingleLogSource>(
+          system_logs::SingleLogSource::SupportedSource)>;
+
+  // Returns a SingleLogSource with source type of |type|. The caller must take
+  // ownership of the returned object.
+  static std::unique_ptr<system_logs::SingleLogSource> CreateSingleLogSource(
+      system_logs::SingleLogSource::SupportedSource type);
+
+  // Pass in a callback that gets executed instead of the default behavior of
+  // CreateSingleLogSource. Does not take ownership of |callback|. When done
+  // testing, call this function again with |callback|=nullptr to restore the
+  // default behavior.
+  static void SetForTesting(CreateCallback* callback);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_FEEDBACK_PRIVATE_SINGLE_LOG_SOURCE_FACTORY_H_