Notify about major session changes events.

ash/shelf/shelf_layout_manager.cc

Index: ash/shelf/shelf_layout_manager.cc
diff --git a/ash/shelf/shelf_layout_manager.cc b/ash/shelf/shelf_layout_manager.cc
index 2a248050bfa5f3846fcb22ecfabab16f13773c8f..97e4d24fccaae6fe46fc3ea829a9be1bf712fe3d 100644
--- a/ash/shelf/shelf_layout_manager.cc
+++ b/ash/shelf/shelf_layout_manager.cc
@@ -213,6 +213,7 @@ ShelfLayoutManager::ShelfLayoutManager(ShelfWidget* shelf)
   Shell::GetInstance()->AddShellObserver(this);
   Shell::GetInstance()->lock_state_controller()->AddObserver(this);
   aura::client::GetActivationClient(root_window_)->AddObserver(this);
+  Shell::GetInstance()->session_state_delegate()->AddSessionStateObserver(this);

[Daniel Erat, 2014/04/10 16:30:32]

you're missing the call to remove this in the d'tor

[Nikita (slow), 2014/04/10 17:22:51]

Done.

 }
 
 ShelfLayoutManager::~ShelfLayoutManager() {
@@ -740,11 +741,16 @@ void ShelfLayoutManager::UpdateBoundsAndOpacity(
           status_bounds));
   SessionStateDelegate* session_state_delegate =
       Shell::GetInstance()->session_state_delegate();
-  if (!state_.is_screen_locked &&
-      (session_state_delegate->IsActiveUserSessionStarted() ||
-       !keyboard_bounds_.IsEmpty())) {
-    Shell::GetInstance()->SetDisplayWorkAreaInsets(
-        root_window_, target_bounds.work_area_insets);
+  if (!state_.is_screen_locked) {
+    gfx::Insets insets;
+    // If user session is blocked (login to new user session or add user to
+    // the existing session - multi-profile) then give 100% of work area only if
+    // keyboard is not shown.
+    if (!session_state_delegate->IsUserSessionBlocked() ||
+        !keyboard_bounds_.IsEmpty()) {
+      insets = target_bounds.work_area_insets;
+    }
+    Shell::GetInstance()->SetDisplayWorkAreaInsets(root_window_, insets);
   }
 }
 
@@ -1165,7 +1171,7 @@ void ShelfLayoutManager::OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) {
   // On login screen if keyboard has been just hidden, update bounds just once
   // but ignore target_bounds.work_area_insets since shelf overlaps with login
   // window.
-  if (!session_state_delegate->IsActiveUserSessionStarted() &&
+  if (session_state_delegate->IsUserSessionBlocked() &&
       keyboard_is_about_to_hide) {
     Shell::GetInstance()->SetDisplayWorkAreaInsets(root_window_, gfx::Insets());
   }
@@ -1200,4 +1206,12 @@ void ShelfLayoutManager::OnLockStateEvent(LockStateObserver::EventType event) {
   }
 }
 
+void ShelfLayoutManager::SessionStateChanged(
+    SessionStateDelegate::SessionState state) {
+  TargetBounds target_bounds;
+  CalculateTargetBounds(state_, &target_bounds);
+  UpdateBoundsAndOpacity(target_bounds, true, NULL);
+  UpdateVisibilityState();
+}
+
 }  // namespace ash