Fix horizontal virtual keyboard icon missing black background and misaligned after login

ash/system/status_area_widget.cc

Index: ash/system/status_area_widget.cc
diff --git a/ash/system/status_area_widget.cc b/ash/system/status_area_widget.cc
index 651c91e73d3c8fbaca9322b076dc6838aedf35ec..a709f527cb307ce051e9d1998756c93d100de24f 100644
--- a/ash/system/status_area_widget.cc
+++ b/ash/system/status_area_widget.cc
@@ -73,6 +73,9 @@ void StatusAreaWidget::CreateTrayViews() {
 #if defined(OS_CHROMEOS)
   logout_button_tray_->Initialize();
   virtual_keyboard_tray_->Initialize();
+  // Initial virtual keyboard alignment for crbug.com/604621.
+  virtual_keyboard_tray_->SetShelfAlignment(
+      virtual_keyboard_tray_->shelf_alignment());

[stevenjb, 2016/05/04 22:57:33]

Should we call SetShelfAlignment(system_tray_->shelf_alignment()) instead to
ensure that all tray items are aligned correctly?

[Qiang(Joe) Xu, 2016/05/04 23:26:45]

agree, that is better.

[stevenjb, 2016/05/05 16:20:49]

Sorry, I wasn't clear. I was suggesting:

  SetShelfAlignment(system_tray_->shelf_alignment())

Which would call SetShelfAlignment for virtual_keyboard_tray_ and all other
elements. This should be outside of the #if CHROMEOS (after all Initialize()
calls).

That does do an extra call to UpdateLayout(), but I think that should be fine.

 #endif
   overview_button_tray_->Initialize();
   UpdateAfterLoginStatusChange(delegate->GetUserLoginStatus());