Initial CL for Data Saver (Flywheel) prompt when cellular network detected

chromeos/network/network_state_handler.cc

Index: chromeos/network/network_state_handler.cc
diff --git a/chromeos/network/network_state_handler.cc b/chromeos/network/network_state_handler.cc
index a3aca7cd658ee8ad372d6cd6552fc6d243302d08..c184bf36f309c0a417f97f9140e758e6fc14bba1 100644
--- a/chromeos/network/network_state_handler.cc
+++ b/chromeos/network/network_state_handler.cc
@@ -5,6 +5,7 @@
 #include "chromeos/network/network_state_handler.h"
 
 #include "base/bind.h"
+#include "base/command_line.h"
 #include "base/format_macros.h"
 #include "base/guid.h"
 #include "base/json/json_string_value_serializer.h"
@@ -16,6 +17,7 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
+#include "chromeos/chromeos_switches.h"
 #include "chromeos/network/device_state.h"
 #include "chromeos/network/network_event_log.h"
 #include "chromeos/network/network_state.h"
@@ -87,6 +89,17 @@ NetworkStateHandler* NetworkStateHandler::InitializeForTest() {
   return handler;
 }
 
+void NetworkStateHandler::DebugNotifyNetworkPropertiesUpdated() {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kEnableDataSaverPrompt))
+    return;
+
+  NetworkState network(kHotkeyDebugDataSaver);
+  base::StringValue val(shill::kTypeCellular);
+  network.PropertyChanged("Type", val);
+  NotifyNetworkPropertiesUpdated(&network);
+}
+
 void NetworkStateHandler::AddObserver(
     NetworkStateHandlerObserver* observer,
     const tracked_objects::Location& from_here) {