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

1 files changed, 5 insertions, 4 deletions

diff --git a/net/url_request/url_request_throttler_manager.cc b/net/url_request/url_request_throttler_manager.cc
index c2fa430..5c50558 100644
--- a/net/url_request/url_request_throttler_manager.cc
+++ b/net/url_request/url_request_throttler_manager.cc
@@ -28,12 +28,12 @@ URLRequestThrottlerManager::URLRequestThrottlerManager()
   url_id_replacements_.ClearRef();
 
   NetworkChangeNotifier::AddIPAddressObserver(this);
-  NetworkChangeNotifier::AddOnlineStateObserver(this);
+  NetworkChangeNotifier::AddConnectionTypeObserver(this);
 }
 
 URLRequestThrottlerManager::~URLRequestThrottlerManager() {
   NetworkChangeNotifier::RemoveIPAddressObserver(this);
-  NetworkChangeNotifier::RemoveOnlineStateObserver(this);
+  NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 
   // Since, for now, the manager object might conceivably go away before
   // the entries, detach the entries' back-pointer to the manager.
@@ -166,7 +166,8 @@ void URLRequestThrottlerManager::OnIPAddressChanged() {
   OnNetworkChange();
 }
 
-void URLRequestThrottlerManager::OnOnlineStateChanged(bool online) {
+void URLRequestThrottlerManager::OnConnectionTypeChanged(
+    NetworkChangeNotifier::ConnectionType type) {
   OnNetworkChange();
 }
 
@@ -207,7 +208,7 @@ void URLRequestThrottlerManager::OnNetworkChange() {
   // Remove all entries.  Any entries that in-flight requests have a reference
   // to will live until those requests end, and these entries may be
   // inconsistent with new entries for the same URLs, but since what we
-  // want is a clean slate for the new connection state, this is OK.
+  // want is a clean slate for the new connection type, this is OK.
   url_entries_.clear();
   requests_since_last_gc_ = 0;
 }