Send notification to users upon receiving sms messages

ash/common/shelf/shelf_widget.cc

Index: ash/common/shelf/shelf_widget.cc
diff --git a/ash/common/shelf/shelf_widget.cc b/ash/common/shelf/shelf_widget.cc
index d735e5897c17a0ddbd815142ed7698def34e053b..d34af55e2e15b81f4f96058aa6087936c4dec1e9 100644
--- a/ash/common/shelf/shelf_widget.cc
+++ b/ash/common/shelf/shelf_widget.cc
@@ -15,6 +15,7 @@
 #include "ash/common/shelf/shelf_view.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
+#include "ash/common/system/chromeos/network/sms_observer.h"
 #include "ash/common/system/status_area_layout_manager.h"
 #include "ash/common/system/status_area_widget.h"
 #include "ash/common/wm_lookup.h"
@@ -222,6 +223,7 @@ ShelfWidget::ShelfWidget(WmWindow* shelf_container, WmShelf* wm_shelf)
       activating_as_fallback_(false) {
   background_animator_.AddObserver(this);
   background_animator_.AddObserver(delegate_view_);
+  sms_observer_.reset(new SmsObserver());
 
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
@@ -384,7 +386,6 @@ void ShelfWidget::Shutdown() {
     status_area_widget_->Shutdown();
     status_area_widget_ = nullptr;
   }
-
   CloseNow();
 }