Revert of Move content/browser/power_save_blocker to //device/power_save_blocker

content/public/browser/power_save_blocker.h

+// Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_
+#define CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_
+
+#include <memory>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"
+#include "base/single_thread_task_runner.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// A RAII-style class to block the system from entering low-power (sleep) mode.
+// This class is thread-safe; it may be constructed and deleted on any thread.
+class CONTENT_EXPORT PowerSaveBlocker {
+ public:
+  enum PowerSaveBlockerType {
+    // Prevent the application from being suspended. On some platforms, apps may
+    // be suspended when they are not visible to the user. This type of block
+    // requests that the app continue to run in that case, and on all platforms
+    // prevents the system from sleeping.
+    // Example use cases: downloading a file, playing audio.
+    kPowerSaveBlockPreventAppSuspension,
+
+    // Prevent the display from going to sleep. This also has the side effect of
+    // preventing the system from sleeping, but does not necessarily prevent the
+    // app from being suspended on some platforms if the user hides it.
+    // Example use case: playing video.
+    kPowerSaveBlockPreventDisplaySleep,
+  };
+
+  // Reasons why power-saving features may be blocked.
+  enum Reason {
+    // Audio is being played.
+    kReasonAudioPlayback,
+    // Video is being played.
+    kReasonVideoPlayback,
+    // Power-saving is blocked for some other reason.
+    kReasonOther,
+  };
+
+  virtual ~PowerSaveBlocker() = 0;
+
+  // Pass in the type of power save blocking desired. If multiple types of
+  // blocking are desired, instantiate one PowerSaveBlocker for each type.
+  // |reason| and |description| (a more-verbose, human-readable justification of
+  // the blocking) may be provided to the underlying system APIs on some
+  // platforms.
+  static std::unique_ptr<PowerSaveBlocker> CreateWithTaskRunners(
+      PowerSaveBlockerType type,
+      Reason reason,
+      const std::string& description,
+      scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_