Support for navigator.connection API

This replaces the online state (a boolean) by a more complex state (UNKNOWN/NONE
/2G/3G/4G/WIFI/ETHERNET) inspired by the Network Information API
(http://www.w3.org/TR/netinfo-api/).

Breakdown of the modified files:
- network_change_notifier.h/.cc: actual API change
- network_change_notifier_*: platform specific implementations. This CL only provide a basic implementation where CONNECTION_UNKNOWN is returned when online and CONNECTION_NONE is returned when offline.
- other files: call sites for the static function and observer implementations. Most of the time this only changes the test IsOffline() by (GetConnectionType() == CONNECTION_NONE).

BUG=112937
TEST=NONE

Review URL: https://chromiumcodereview.appspot.com/9147026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138780 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 10 insertions, 8 deletions

diff --git a/remoting/host/signaling_connector.cc b/remoting/host/signaling_connector.cc
index a9bef15..e93c398 100644
--- a/remoting/host/signaling_connector.cc
+++ b/remoting/host/signaling_connector.cc
@@ -39,7 +39,7 @@ SignalingConnector::SignalingConnector(
       reconnect_attempts_(0),
       refreshing_oauth_token_(false) {
   DCHECK(!auth_failed_callback_.is_null());
-  net::NetworkChangeNotifier::AddOnlineStateObserver(this);
+  net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
   net::NetworkChangeNotifier::AddIPAddressObserver(this);
   signal_strategy_->AddListener(this);
   ScheduleTryReconnect();
@@ -47,7 +47,7 @@ SignalingConnector::SignalingConnector(
 
 SignalingConnector::~SignalingConnector() {
   signal_strategy_->RemoveListener(this);
-  net::NetworkChangeNotifier::RemoveOnlineStateObserver(this);
+  net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
   net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 }
 
@@ -86,9 +86,10 @@ void SignalingConnector::OnIPAddressChanged() {
   ResetAndTryReconnect();
 }
 
-void SignalingConnector::OnOnlineStateChanged(bool online) {
+void SignalingConnector::OnConnectionTypeChanged(
+    net::NetworkChangeNotifier::ConnectionType type) {
   DCHECK(CalledOnValidThread());
-  if (online) {
+  if (type != net::NetworkChangeNotifier::CONNECTION_NONE) {
     LOG(INFO) << "Network state changed to online.";
     ResetAndTryReconnect();
   }
diff --git a/remoting/host/signaling_connector.h b/remoting/host/signaling_connector.h
index 4b432f3..582b4ae 100644
--- a/remoting/host/signaling_connector.h
+++ b/remoting/host/signaling_connector.h
@@ -24,12 +24,12 @@ namespace remoting {
 // not connected it keeps trying to reconnect it until it is
 // connected. It limits connection attempt rate using exponential
 // backoff. It also monitors network state and reconnects signalling
-// whenever online state changes or IP address changes.
+// whenever connection type changes or IP address changes.
 class SignalingConnector
     : public base::SupportsWeakPtr<SignalingConnector>,
       public base::NonThreadSafe,
       public SignalStrategy::Listener,
-      public net::NetworkChangeNotifier::OnlineStateObserver,
+      public net::NetworkChangeNotifier::ConnectionTypeObserver,
       public net::NetworkChangeNotifier::IPAddressObserver,
       public GaiaOAuthClient::Delegate {
  public:
@@ -67,8 +67,9 @@ class SignalingConnector
   // NetworkChangeNotifier::IPAddressObserver interface.
   virtual void OnIPAddressChanged() OVERRIDE;
 
-  // NetworkChangeNotifier::OnlineStateObserver interface.
-  virtual void OnOnlineStateChanged(bool online) OVERRIDE;
+  // NetworkChangeNotifier::ConnectionTypeObserver interface.
+  virtual void OnConnectionTypeChanged(
+      net::NetworkChangeNotifier::ConnectionType type) OVERRIDE;
 
   // GaiaOAuthClient::Delegate interface.
   virtual void OnRefreshTokenResponse(const std::string& user_email,