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

third_party/WebKit/Source/modules/battery/BatteryDispatcher.cpp

 // 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.
 
 #include "modules/battery/BatteryDispatcher.h"
 
-#include "modules/battery/BatteryStatus.h"
-#include "public/platform/Platform.h"
+#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
-namespace {
-
-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 round(level * 100) / 100.f;
-}
-
-} // namespace
-
-
 BatteryDispatcher& BatteryDispatcher::instance()
 {
     DEFINE_STATIC_LOCAL(Persistent<BatteryDispatcher>, batteryDispatcher, (new BatteryDispatcher()));
     return *batteryDispatcher;
 }
 
 BatteryDispatcher::BatteryDispatcher()
+    : m_hasLatestData(false)
 {
 }
 
 BatteryDispatcher::~BatteryDispatcher()
 {
 }
 
-DEFINE_TRACE(BatteryDispatcher)
+void BatteryDispatcher::onUpdateBatteryStatus(const BatteryStatus& batteryStatus)
 {
-    visitor->trace(m_batteryStatus);
-    PlatformEventDispatcher::trace(visitor);
-}
-
-void BatteryDispatcher::updateBatteryStatus(const WebBatteryStatus& batteryStatus)
-{
-    m_batteryStatus = BatteryStatus::create(
-        batteryStatus.charging, batteryStatus.chargingTime, batteryStatus.dischargingTime,
-        ensureTwoSignificantDigits(batteryStatus.level));
+    m_batteryStatus = batteryStatus;
+    m_hasLatestData = true;
     notifyControllers();
 }
 
-BatteryStatus* BatteryDispatcher::latestData()
-{
-    return m_batteryStatus.get();
-}
-
 void BatteryDispatcher::startListening()
 {
-    Platform::current()->startListening(WebPlatformEventTypeBattery, this);
+    m_batteryStatusDispatcher = adoptPtr(new BatteryStatusDispatcher(this));
 }
 
 void BatteryDispatcher::stopListening()
 {
-    Platform::current()->stopListening(WebPlatformEventTypeBattery);
-    m_batteryStatus.clear();
+    m_batteryStatusDispatcher.clear();
+    m_hasLatestData = false;
 }
 
 } // namespace blink