Revert 76228 - Move core pieces of geolocation from chrome to content.This is...

content/browser/geolocation/wifi_data_provider_common.cc

-// Copyright (c) 2010 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 "content/browser/geolocation/wifi_data_provider_common.h"
-
-#include "base/utf_string_conversions.h"
-
-string16 MacAddressAsString16(const uint8 mac_as_int[6]) {
-  // mac_as_int is big-endian. Write in byte chunks.
-  // Format is XX-XX-XX-XX-XX-XX.
-  static const wchar_t* const kMacFormatString =
-      L"%02x-%02x-%02x-%02x-%02x-%02x";
-  return WideToUTF16(StringPrintf(kMacFormatString,
-                                  mac_as_int[0], mac_as_int[1], mac_as_int[2],
-                                  mac_as_int[3], mac_as_int[4], mac_as_int[5]));
-}
-
-WifiDataProviderCommon::WifiDataProviderCommon()
-    : Thread("Geolocation_wifi_provider"),
-      is_first_scan_complete_(false),
-      ALLOW_THIS_IN_INITIALIZER_LIST(task_factory_(this)) {
-}
-
-WifiDataProviderCommon::~WifiDataProviderCommon() {
-  // Thread must be stopped before entering destructor chain to avoid race
-  // conditions; see comment in DeviceDataProvider::Unregister.
-  DCHECK(!IsRunning());  // Must call StopDataProvider before destroying me.
-}
-
-bool WifiDataProviderCommon::StartDataProvider() {
-  DCHECK(CalledOnClientThread());
-  DCHECK(!IsRunning());  // StartDataProvider must only be called once.
-  return Start();
-}
-
-void WifiDataProviderCommon::StopDataProvider() {
-  DCHECK(CalledOnClientThread());
-  Stop();
-}
-
-bool WifiDataProviderCommon::GetData(WifiData *data) {
-  DCHECK(CalledOnClientThread());
-  DCHECK(data);
-  base::AutoLock lock(data_mutex_);
-  *data = wifi_data_;
-  // If we've successfully completed a scan, indicate that we have all of the
-  // data we can get.
-  return is_first_scan_complete_;
-}
-
-// Thread implementation
-void WifiDataProviderCommon::Init() {
-  DCHECK(wlan_api_ == NULL);
-  wlan_api_.reset(NewWlanApi());
-  if (wlan_api_ == NULL) {
-    // Error! Can't do scans, so don't try and schedule one.
-    is_first_scan_complete_ = true;
-    return;
-  }
-
-  DCHECK(polling_policy_ == NULL);
-  polling_policy_.reset(NewPollingPolicy());
-  DCHECK(polling_policy_ != NULL);
-
-  // Perform first scan ASAP regardless of the polling policy. If this scan
-  // fails we'll retry at a rate in line with the polling policy.
-  ScheduleNextScan(0);
-}
-
-void WifiDataProviderCommon::CleanUp() {
-  // Destroy these instances in the thread on which they were created.
-  wlan_api_.reset();
-  polling_policy_.reset();
-}
-
-void WifiDataProviderCommon::DoWifiScanTask() {
-  bool update_available = false;
-  WifiData new_data;
-  if (!wlan_api_->GetAccessPointData(&new_data.access_point_data)) {
-    ScheduleNextScan(polling_policy_->NoWifiInterval());
-  } else {
-    {
-      base::AutoLock lock(data_mutex_);
-      update_available = wifi_data_.DiffersSignificantly(new_data);
-      wifi_data_ = new_data;
-    }
-    polling_policy_->UpdatePollingInterval(update_available);
-    ScheduleNextScan(polling_policy_->PollingInterval());
-  }
-  if (update_available || !is_first_scan_complete_) {
-    is_first_scan_complete_ = true;
-    NotifyListeners();
-  }
-}
-
-void WifiDataProviderCommon::ScheduleNextScan(int interval) {
-  message_loop()->PostDelayedTask(
-      FROM_HERE,
-      task_factory_.NewRunnableMethod(&WifiDataProviderCommon::DoWifiScanTask),
-      interval);
-}