Show offline interstitial page when offline and reload when reconnected to network.

chrome/browser/chromeos/network_state_notifier.cc

Index: chrome/browser/chromeos/network_state_notifier.cc
diff --git a/chrome/browser/chromeos/network_state_notifier.cc b/chrome/browser/chromeos/network_state_notifier.cc
index 2d1303048fde05193849d8784547260f8ccd9696..3ee696c1bf8db805f5d03dbcde757311291297a9 100644
--- a/chrome/browser/chromeos/network_state_notifier.cc
+++ b/chrome/browser/chromeos/network_state_notifier.cc
@@ -2,23 +2,38 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "chrome/browser/chromeos/network_state_notifier.h"
+
+#include "base/message_loop.h"
+#include "base/time.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
-#include "chrome/browser/chromeos/network_state_notifier.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/notification_type.h"
 
-#include "base/message_loop.h"
-
 namespace chromeos {
 
+using base::Time;
+using base::TimeDelta;
+
+// static
 NetworkStateNotifier* NetworkStateNotifier::Get() {
   return Singleton<NetworkStateNotifier>::get();
 }
 
+// static
+TimeDelta NetworkStateNotifier::GetOfflineDuration() {
+  DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
+  // TODO(oshima): make this instance method so that
+  // we can mock this for ui_tests.
+  // http://crbug.com/4825 .
+  return base::Time::Now() - Get()->offline_start_time_;
+}
+
 NetworkStateNotifier::NetworkStateNotifier()
-    : task_factory_(this) {
-  state_ = RetrieveState();
+    : ALLOW_THIS_IN_INITIALIZER_LIST(task_factory_(this)),
+      state_(RetrieveState()),
+      offline_start_time_(Time::Now()) {
 }
 
 void NetworkStateNotifier::NetworkChanged(NetworkLibrary* cros) {
@@ -37,6 +52,11 @@ void NetworkStateNotifier::UpdateNetworkState(
     NetworkStateDetails::State new_state) {
   DLOG(INFO) << "UpdateNetworkState: new="
              << new_state << ", old=" << state_;
+  if (state_ == NetworkStateDetails::CONNECTED &&
+      new_state != NetworkStateDetails::CONNECTED) {
+    offline_start_time_ = Time::Now();
+  }
+
   state_ = new_state;
   NetworkStateDetails details(state_);
   NotificationService::current()->Notify(