Add device location reporting

content/browser/geolocation/geolocation_provider.cc

Index: content/browser/geolocation/geolocation_provider.cc
diff --git a/content/browser/geolocation/geolocation_provider.cc b/content/browser/geolocation/geolocation_provider.cc
index e090ac9b76c1175774a78908447ec86174098835..fe68b3e48c569f2eedb006f06d67f3850b6017d7 100644
--- a/content/browser/geolocation/geolocation_provider.cc
+++ b/content/browser/geolocation/geolocation_provider.cc
@@ -5,20 +5,20 @@
 #include "content/browser/geolocation/geolocation_provider.h"
 
 #include "base/bind.h"
-#include "base/bind_helpers.h"
 #include "base/memory/singleton.h"
-#include "base/threading/thread_restrictions.h"
 #include "content/browser/geolocation/location_arbitrator.h"
+#include "content/public/browser/browser_thread.h"
 
 GeolocationProvider* GeolocationProvider::GetInstance() {
+  DCHECK(OnIOThread());
   return Singleton<GeolocationProvider>::get();
 }
 
 GeolocationProvider::GeolocationProvider()
     : base::Thread("Geolocation"),
-      client_loop_(base::MessageLoopProxy::current()),
       is_permission_granted_(false),
       arbitrator_(NULL) {
+  DCHECK(OnIOThread());
 }
 
 GeolocationProvider::~GeolocationProvider() {
@@ -29,7 +29,7 @@ GeolocationProvider::~GeolocationProvider() {
 
 void GeolocationProvider::AddObserver(GeolocationObserver* observer,
     const GeolocationObserverOptions& update_options) {
-  DCHECK(OnClientThread());
+  DCHECK(OnIOThread());
   observers_[observer] = update_options;
   OnObserversChanged();
   if (position_.IsInitialized())
@@ -37,14 +37,14 @@ void GeolocationProvider::AddObserver(GeolocationObserver* observer,
 }
 
 bool GeolocationProvider::RemoveObserver(GeolocationObserver* observer) {
-  DCHECK(OnClientThread());
+  DCHECK(OnIOThread());
   size_t remove = observers_.erase(observer);
   OnObserversChanged();
   return remove > 0;
 }
 
 void GeolocationProvider::OnObserversChanged() {
-  DCHECK(OnClientThread());
+  DCHECK(OnIOThread());
   base::Closure task;
   if (observers_.empty()) {
     DCHECK(IsRunning());
@@ -67,7 +67,7 @@ void GeolocationProvider::OnObserversChanged() {
 }
 
 void GeolocationProvider::NotifyObservers(const Geoposition& position) {
-  DCHECK(OnClientThread());
+  DCHECK(OnIOThread());
   DCHECK(position.IsInitialized());
   position_ = position;
   ObserverMap::const_iterator it = observers_.begin();
@@ -93,7 +93,7 @@ void GeolocationProvider::StopProviders() {
 }
 
 void GeolocationProvider::OnPermissionGranted() {
-  DCHECK(OnClientThread());
+  DCHECK(OnIOThread());
   is_permission_granted_ = true;
   if (IsRunning())
     InformProvidersPermissionGranted();
@@ -127,19 +127,21 @@ void GeolocationProvider::CleanUp() {
 
 void GeolocationProvider::OnLocationUpdate(const Geoposition& position) {
   DCHECK(OnGeolocationThread());
-  client_loop_->PostTask(
+  content::BrowserThread::PostTask(
+      content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(&GeolocationProvider::NotifyObservers,
                  base::Unretained(this), position));
 }
 
 bool GeolocationProvider::HasPermissionBeenGranted() const {
-  DCHECK(OnClientThread());
+  DCHECK(OnIOThread());
   return is_permission_granted_;
 }
 
-bool GeolocationProvider::OnClientThread() const {
-  return client_loop_->BelongsToCurrentThread();
+// static
+bool GeolocationProvider::OnIOThread() {
+  return content::BrowserThread::CurrentlyOn(content::BrowserThread::IO);
 }
 
 bool GeolocationProvider::OnGeolocationThread() const {