Revert of Migrates battery_status from content/renderer/ to WebKit/platform/

third_party/WebKit/Source/platform/battery/battery_status.h

-// Copyright 2014 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 BLINK_PLATFORM_BATTERY_BATTERY_STATUS_H_
-#define BLINK_PLATFORM_BATTERY_BATTERY_STATUS_H_
-
-#include "platform/PlatformExport.h"
-#include "wtf/Assertions.h"
-
-#include <cmath>
-#include <limits>
-
-namespace blink {
-
-// Simple struct to hold the battery status.  This class is copyable.
-class PLATFORM_EXPORT BatteryStatus final {
- public:
-  BatteryStatus()
-      : charging_(true),
-        charging_time_(0),
-        discharging_time_(std::numeric_limits<double>::infinity()),
-        level_(1) {}
-  BatteryStatus(bool charging,
-                double charging_time,
-                double discharging_time,
-                double level)
-      : charging_(charging),
-        charging_time_(charging_time),
-        discharging_time_(discharging_time),
-        level_(EnsureTwoSignificantDigits(level)) {}
-  BatteryStatus(const BatteryStatus&) = default;
-  BatteryStatus& operator=(const BatteryStatus&) = default;
-
-  bool charging() const { return charging_; }
-  double charging_time() const { return charging_time_; }
-  double discharging_time() const { return discharging_time_; }
-  double level() const { return level_; }
-
- private:
-  double EnsureTwoSignificantDigits(double level) {
-    // Convert battery level value which should be in [0, 1] to a value in
-    // [0, 1] with 2 digits of precision. This is to provide a consistent
-    // experience across platforms (e.g. on Mac and Android the battery changes
-    // are generally reported with 1% granularity). It also serves the purpose
-    // of reducing the possibility of fingerprinting and triggers less level
-    // change events on platforms where the granularity is high.
-    ASSERT(level >= 0 && level <= 1);
-    return std::round(level * 100) / 100.f;
-  }
-
-  bool charging_;
-  double charging_time_;
-  double discharging_time_;
-  double level_;
-};
-
-}  // namespace blink
-
-#endif  // BLINK_PLATFORM_BATTERY_BATTERY_STATUS_H_