Move core pieces of geolocation from chrome to content....

chrome/browser/geolocation/win7_location_provider_win.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 "chrome/browser/geolocation/win7_location_provider_win.h"
-
-#include <algorithm>
-#include <cmath>
-
-#include "base/compiler_specific.h"
-#include "base/logging.h"
-#include "base/message_loop.h"
-
-namespace{
-const int kPollPeriodMovingMillis = 500;
-// Poll less frequently whilst stationary.
-const int kPollPeriodStationaryMillis = kPollPeriodMovingMillis * 3;
-// Reading must differ by more than this amount to be considered movement.
-const int kMovementThresholdMeters = 20;
-
-// This algorithm is reused from the corresponding code in the gears project
-// and is also used in gps_location_provider_linux.cc
-// The arbitrary delta is decreased (gears used 100 meters); if we need to
-// decrease it any further we'll likely want to do some smarter filtering to
-// remove GPS location jitter noise.
-bool PositionsDifferSiginificantly(const Geoposition& position_1,
-                                   const Geoposition& position_2) {
-  const bool pos_1_valid = position_1.IsValidFix();
-  if (pos_1_valid != position_2.IsValidFix())
-    return true;
-  if (!pos_1_valid) {
-    DCHECK(!position_2.IsValidFix());
-    return false;
-  }
-  double delta = std::sqrt(
-      std::pow(std::fabs(position_1.latitude - position_2.latitude), 2) +
-      std::pow(std::fabs(position_1.longitude - position_2.longitude), 2));
-  // Convert to meters. 1 minute of arc of latitude (or longitude at the
-  // equator) is 1 nautical mile or 1852m.
-  delta *= 60 * 1852;
-  return delta > kMovementThresholdMeters;
-}
-}
-
-Win7LocationProvider::Win7LocationProvider(Win7LocationApi* api)
-    : ALLOW_THIS_IN_INITIALIZER_LIST(task_factory_(this)) {
-  DCHECK(api != NULL);
-  api_.reset(api);
-}
-
-Win7LocationProvider::~Win7LocationProvider() {
-  api_.reset();
-}
-
-bool Win7LocationProvider::StartProvider(bool high_accuracy){
-  if (api_ == NULL)
-    return false;
-  api_->SetHighAccuracy(high_accuracy);
-  if (task_factory_.empty())
-    ScheduleNextPoll(0);
-  return true;
-}
-
-void Win7LocationProvider::StopProvider() {
-  task_factory_.RevokeAll();
-}
-
-void Win7LocationProvider::GetPosition(Geoposition* position) {
-  DCHECK(position);
-  *position = position_;
-}
-
-void Win7LocationProvider::UpdatePosition() {
-  ScheduleNextPoll(0);
-}
-
-void Win7LocationProvider::OnPermissionGranted(
-  const GURL& requesting_frame) {
-}
-
-void Win7LocationProvider::DoPollTask() {
-  Geoposition new_position;
-  api_->GetPosition(&new_position);
-  const bool differ = PositionsDifferSiginificantly(position_, new_position);
-  ScheduleNextPoll(differ ? kPollPeriodMovingMillis :
-                            kPollPeriodStationaryMillis);
-  if (differ || new_position.error_code != Geoposition::ERROR_CODE_NONE) {
-    // Update if the new location is interesting or we have an error to report
-    position_ = new_position;
-    UpdateListeners();
-  }
-}
-
-void Win7LocationProvider::ScheduleNextPoll(int interval) {
-  MessageLoop::current()->PostDelayedTask(
-      FROM_HERE,
-      task_factory_.NewRunnableMethod(&Win7LocationProvider::DoPollTask),
-      interval);
-}
-
-LocationProviderBase* NewSystemLocationProvider() {
-  Win7LocationApi* api = Win7LocationApi::Create();
-  if (api == NULL)
-    return NULL; // API not supported on this machine.
-  return new Win7LocationProvider(api);
-}