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

chrome/browser/geolocation/gps_location_provider_linux.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/gps_location_provider_linux.h"
-
-#include <algorithm>
-#include <cmath>
-#include "base/compiler_specific.h"
-#include "base/logging.h"
-#include "base/message_loop.h"
-#include "chrome/browser/geolocation/libgps_wrapper_linux.h"
-
-namespace {
-const int kGpsdReconnectRetryIntervalMillis = 10 * 1000;
-// As per http://gpsd.berlios.de/performance.html#id374524, poll twice per sec.
-const int kPollPeriodMovingMillis = 500;
-// Poll less frequently whilst stationary.
-const int kPollPeriodStationaryMillis = kPollPeriodMovingMillis * 3;
-// GPS 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.
-// 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;
-}
-}  // namespace
-
-GpsLocationProviderLinux::GpsLocationProviderLinux(LibGpsFactory libgps_factory)
-    : libgps_factory_(libgps_factory),
-      ALLOW_THIS_IN_INITIALIZER_LIST(task_factory_(this)) {
-  DCHECK(libgps_factory_);
-}
-
-GpsLocationProviderLinux::~GpsLocationProviderLinux() {
-}
-
-bool GpsLocationProviderLinux::StartProvider(bool high_accuracy) {
-  if (!high_accuracy) {
-    StopProvider();
-    return true;  // Not an error condition, so still return true.
-  }
-  if (gps_ != NULL) {
-    DCHECK(!task_factory_.empty());
-    return true;
-  }
-  position_.error_code = Geoposition::ERROR_CODE_POSITION_UNAVAILABLE;
-  gps_.reset(libgps_factory_());
-  if (gps_ == NULL) {
-    DLOG(WARNING) << "libgps.so could not be loaded";
-    return false;
-  }
-  ScheduleNextGpsPoll(0);
-  return true;
-}
-
-void GpsLocationProviderLinux::StopProvider() {
-  task_factory_.RevokeAll();
-  gps_.reset();
-}
-
-void GpsLocationProviderLinux::GetPosition(Geoposition* position) {
-  DCHECK(position);
-  *position = position_;
-  DCHECK(position->IsInitialized());
-}
-
-void GpsLocationProviderLinux::UpdatePosition() {
-  ScheduleNextGpsPoll(0);
-}
-
-void GpsLocationProviderLinux::OnPermissionGranted(
-    const GURL& requesting_frame) {
-}
-
-void GpsLocationProviderLinux::DoGpsPollTask() {
-  if (!gps_->Start()) {
-    DLOG(WARNING) << "Couldn't start GPS provider.";
-    ScheduleNextGpsPoll(kGpsdReconnectRetryIntervalMillis);
-    return;
-  }
-  if (!gps_->Poll()) {
-    ScheduleNextGpsPoll(kPollPeriodStationaryMillis);
-    return;
-  }
-  Geoposition new_position;
-  gps_->GetPosition(&new_position);
-  DCHECK(new_position.IsInitialized());
-  const bool differ = PositionsDifferSiginificantly(position_, new_position);
-  ScheduleNextGpsPoll(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 GpsLocationProviderLinux::ScheduleNextGpsPoll(int interval) {
-  task_factory_.RevokeAll();
-  MessageLoop::current()->PostDelayedTask(
-      FROM_HERE,
-      task_factory_.NewRunnableMethod(&GpsLocationProviderLinux::DoGpsPollTask),
-      interval);
-}
-
-LocationProviderBase* NewSystemLocationProvider() {
-  return new GpsLocationProviderLinux(LibGps::New);
-}