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

chrome/browser/geolocation/location_arbitrator.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/location_arbitrator.h"
-
-#include <map>
-
-#include "chrome/browser/geolocation/arbitrator_dependency_factory.h"
-#include "chrome/browser/profiles/profile.h"
-
-namespace {
-
-const char* kDefaultNetworkProviderUrl = "https://www.google.com/loc/json";
-GeolocationArbitratorDependencyFactory* g_dependency_factory_for_test = NULL;
-
-}  // namespace
-
-// To avoid oscillations, set this to twice the expected update interval of a
-// a GPS-type location provider (in case it misses a beat) plus a little.
-const int64 GeolocationArbitrator::kFixStaleTimeoutMilliseconds =
-    11 * base::Time::kMillisecondsPerSecond;
-
-GeolocationArbitrator::GeolocationArbitrator(
-    GeolocationArbitratorDependencyFactory* dependency_factory,
-    GeolocationObserver* observer)
-    : dependency_factory_(dependency_factory),
-      access_token_store_(dependency_factory->NewAccessTokenStore()),
-      context_getter_(dependency_factory->GetContextGetter()),
-      get_time_now_(dependency_factory->GetTimeFunction()),
-      observer_(observer),
-      position_provider_(NULL) {
-  DCHECK(GURL(kDefaultNetworkProviderUrl).is_valid());
-  access_token_store_->LoadAccessTokens(
-      &request_consumer_,
-      NewCallback(this,
-                  &GeolocationArbitrator::OnAccessTokenStoresLoaded));
-}
-
-GeolocationArbitrator::~GeolocationArbitrator() {
-}
-
-GeolocationArbitrator* GeolocationArbitrator::Create(
-    GeolocationObserver* observer) {
-  GeolocationArbitratorDependencyFactory* dependency_factory =
-      g_dependency_factory_for_test ?
-      g_dependency_factory_for_test :
-      new DefaultGeolocationArbitratorDependencyFactory;
-  GeolocationArbitrator* arbitrator =
-      new GeolocationArbitrator(dependency_factory, observer);
-  g_dependency_factory_for_test = NULL;
-  return arbitrator;
-}
-
-void GeolocationArbitrator::OnPermissionGranted(
-    const GURL& requesting_frame) {
-  most_recent_authorized_frame_ = requesting_frame;
-  for (ScopedVector<LocationProviderBase>::iterator i = providers_.begin();
-      i != providers_.end(); ++i) {
-    (*i)->OnPermissionGranted(requesting_frame);
-  }
-}
-
-void GeolocationArbitrator::StartProviders(
-    const GeolocationObserverOptions& options) {
-  // Stash options incase OnAccessTokenStoresLoaded has not yet been called
-  // (in which case |providers_| will be empty).
-  current_provider_options_ = options;
-  StartProviders();
-}
-
-void GeolocationArbitrator::StartProviders() {
-  for (ScopedVector<LocationProviderBase>::iterator i = providers_.begin();
-       i != providers_.end(); ++i) {
-    (*i)->StartProvider(current_provider_options_.use_high_accuracy);
-  }
-}
-
-void GeolocationArbitrator::StopProviders() {
-  for (ScopedVector<LocationProviderBase>::iterator i = providers_.begin();
-       i != providers_.end(); ++i) {
-    (*i)->StopProvider();
-  }
-}
-
-void GeolocationArbitrator::OnAccessTokenStoresLoaded(
-    AccessTokenStore::AccessTokenSet access_token_set) {
-  DCHECK(providers_.empty())
-      << "OnAccessTokenStoresLoaded : has existing location "
-      << "provider. Race condition caused repeat load of tokens?";
-  // If there are no access tokens, boot strap it with the default server URL.
-  if (access_token_set.empty())
-    access_token_set[GURL(kDefaultNetworkProviderUrl)];
-  for (AccessTokenStore::AccessTokenSet::iterator i =
-           access_token_set.begin();
-      i != access_token_set.end(); ++i) {
-    RegisterProvider(
-        dependency_factory_->NewNetworkLocationProvider(
-            access_token_store_.get(), context_getter_.get(),
-            i->first, i->second));
-  }
-  RegisterProvider(dependency_factory_->NewSystemLocationProvider());
-  StartProviders();
-}
-
-void GeolocationArbitrator::RegisterProvider(
-    LocationProviderBase* provider) {
-  if (!provider)
-    return;
-  provider->RegisterListener(this);
-  if (most_recent_authorized_frame_.is_valid())
-    provider->OnPermissionGranted(most_recent_authorized_frame_);
-  providers_->push_back(provider);
-}
-
-void GeolocationArbitrator::LocationUpdateAvailable(
-    LocationProviderBase* provider) {
-  DCHECK(provider);
-  Geoposition new_position;
-  provider->GetPosition(&new_position);
-  DCHECK(new_position.IsInitialized());
-  if (!IsNewPositionBetter(position_, new_position,
-                           provider == position_provider_))
-    return;
-  position_provider_ = provider;
-  position_ = new_position;
-  observer_->OnLocationUpdate(position_);
-}
-
-bool GeolocationArbitrator::IsNewPositionBetter(
-    const Geoposition& old_position, const Geoposition& new_position,
-    bool from_same_provider) const {
-  // Updates location_info if it's better than what we currently have,
-  // or if it's a newer update from the same provider.
-  if (!old_position.IsValidFix()) {
-    // Older location wasn't locked.
-    return true;
-  }
-  if (new_position.IsValidFix()) {
-    // New location is locked, let's check if it's any better.
-    if (old_position.accuracy >= new_position.accuracy) {
-      // Accuracy is better.
-      return true;
-    } else if (from_same_provider) {
-      // Same provider, fresher location.
-      return true;
-    } else if ((get_time_now_() - old_position.timestamp).InMilliseconds() >
-               kFixStaleTimeoutMilliseconds) {
-      // Existing fix is stale.
-      return true;
-    }
-  }
-  return false;
-}
-
-bool GeolocationArbitrator::HasPermissionBeenGranted() const {
-  return most_recent_authorized_frame_.is_valid();
-}
-
-void GeolocationArbitrator::SetDependencyFactoryForTest(
-    GeolocationArbitratorDependencyFactory* dependency_factory) {
-  g_dependency_factory_for_test = dependency_factory;
-}