Revert of Reland: Geolocation: move from content/browser to device/

content/browser/geolocation/wifi_data_provider_chromeos.cc

Index: content/browser/geolocation/wifi_data_provider_chromeos.cc
diff --git a/content/browser/geolocation/wifi_data_provider_chromeos.cc b/content/browser/geolocation/wifi_data_provider_chromeos.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4f148667f6357abfb87d4cdc5d978e3236d91e36
--- /dev/null
+++ b/content/browser/geolocation/wifi_data_provider_chromeos.cc
@@ -0,0 +1,175 @@
+// 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.
+
+// Provides wifi scan API binding for chromeos, using proprietary APIs.
+
+#include "content/browser/geolocation/wifi_data_provider_chromeos.h"
+
+#include <stdint.h>
+
+#include "base/bind.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chromeos/network/geolocation_handler.h"
+#include "content/browser/geolocation/wifi_data_provider_manager.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+namespace {
+
+// The time periods between successive polls of the wifi data.
+const int kDefaultPollingIntervalMilliseconds = 10 * 1000;  // 10s
+const int kNoChangePollingIntervalMilliseconds = 2 * 60 * 1000;  // 2 mins
+const int kTwoNoChangePollingIntervalMilliseconds = 10 * 60 * 1000;  // 10 mins
+const int kNoWifiPollingIntervalMilliseconds = 20 * 1000; // 20s
+
+}  // namespace
+
+WifiDataProviderChromeOs::WifiDataProviderChromeOs()
+    : started_(false), is_first_scan_complete_(false) {
+}
+
+WifiDataProviderChromeOs::~WifiDataProviderChromeOs() {
+}
+
+void WifiDataProviderChromeOs::StartDataProvider() {
+  DCHECK(CalledOnClientThread());
+
+  DCHECK(polling_policy_ == NULL);
+  polling_policy_.reset(
+      new GenericWifiPollingPolicy<kDefaultPollingIntervalMilliseconds,
+                                   kNoChangePollingIntervalMilliseconds,
+                                   kTwoNoChangePollingIntervalMilliseconds,
+                                   kNoWifiPollingIntervalMilliseconds>);
+
+  ScheduleStart();
+}
+
+void WifiDataProviderChromeOs::StopDataProvider() {
+  DCHECK(CalledOnClientThread());
+
+  polling_policy_.reset();
+  ScheduleStop();
+}
+
+bool WifiDataProviderChromeOs::GetData(WifiData* data) {
+  DCHECK(CalledOnClientThread());
+  DCHECK(data);
+  *data = wifi_data_;
+  return is_first_scan_complete_;
+}
+
+void WifiDataProviderChromeOs::DoStartTaskOnUIThread() {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DoWifiScanTaskOnUIThread();
+}
+
+void WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread() {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  // This method could be scheduled after a ScheduleStop.
+  if (!started_)
+    return;
+
+  WifiData new_data;
+
+  if (GetAccessPointData(&new_data.access_point_data)) {
+    client_task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&WifiDataProviderChromeOs::DidWifiScanTask, this, new_data));
+  } else {
+    client_task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&WifiDataProviderChromeOs::DidWifiScanTaskNoResults, this));
+  }
+}
+
+void WifiDataProviderChromeOs::DidWifiScanTaskNoResults() {
+  DCHECK(CalledOnClientThread());
+  // Schedule next scan if started (StopDataProvider could have been called
+  // in between DoWifiScanTaskOnUIThread and this method).
+  if (started_)
+    ScheduleNextScan(polling_policy_->NoWifiInterval());
+}
+
+void WifiDataProviderChromeOs::DidWifiScanTask(const WifiData& new_data) {
+  DCHECK(CalledOnClientThread());
+  bool update_available = wifi_data_.DiffersSignificantly(new_data);
+  wifi_data_ = new_data;
+  // Schedule next scan if started (StopDataProvider could have been called
+  // in between DoWifiScanTaskOnUIThread and this method).
+  if (started_) {
+    polling_policy_->UpdatePollingInterval(update_available);
+    ScheduleNextScan(polling_policy_->PollingInterval());
+  }
+
+  if (update_available || !is_first_scan_complete_) {
+    is_first_scan_complete_ = true;
+    RunCallbacks();
+  }
+}
+
+void WifiDataProviderChromeOs::ScheduleNextScan(int interval) {
+  DCHECK(CalledOnClientThread());
+  DCHECK(started_);
+  BrowserThread::PostDelayedTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread, this),
+      base::TimeDelta::FromMilliseconds(interval));
+}
+
+void WifiDataProviderChromeOs::ScheduleStop() {
+  DCHECK(CalledOnClientThread());
+  DCHECK(started_);
+  started_ = false;
+}
+
+void WifiDataProviderChromeOs::ScheduleStart() {
+  DCHECK(CalledOnClientThread());
+  DCHECK(!started_);
+  started_ = true;
+  // 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.
+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(&WifiDataProviderChromeOs::DoStartTaskOnUIThread, this));
+}
+
+bool WifiDataProviderChromeOs::GetAccessPointData(
+    WifiData::AccessPointDataSet* result) {
+  // If wifi isn't enabled, we've effectively completed the task.
+  // Return true to indicate an empty access point list.
+  if (!chromeos::NetworkHandler::Get()->geolocation_handler()->wifi_enabled())
+    return true;
+
+  chromeos::WifiAccessPointVector access_points;
+  int64_t age_ms = 0;
+  if (!chromeos::NetworkHandler::Get()->geolocation_handler()->
+      GetWifiAccessPoints(&access_points, &age_ms)) {
+    return false;
+  }
+  for (const auto& access_point : access_points) {
+    AccessPointData ap_data;
+    ap_data.mac_address = base::ASCIIToUTF16(access_point.mac_address);
+    ap_data.radio_signal_strength = access_point.signal_strength;
+    ap_data.channel = access_point.channel;
+    ap_data.signal_to_noise = access_point.signal_to_noise;
+    ap_data.ssid = base::UTF8ToUTF16(access_point.ssid);
+    result->insert(ap_data);
+  }
+  // If the age is significantly longer than our long polling time, assume the
+  // data is stale and return false which will trigger a faster update.
+  if (age_ms > kTwoNoChangePollingIntervalMilliseconds * 2)
+    return false;
+  return true;
+}
+
+// static
+WifiDataProvider* WifiDataProviderManager::DefaultFactoryFunction() {
+  return new WifiDataProviderChromeOs();
+}
+
+}  // namespace content