ash/immersive mode: Hide the launcher when entering immersive mode

ash/wm/shelf_layout_manager.cc

Index: ash/wm/shelf_layout_manager.cc
diff --git a/ash/wm/shelf_layout_manager.cc b/ash/wm/shelf_layout_manager.cc
index a04a05f52020af5b53cb1b0b85442de7d8a0bbdb..85130c2a39834c28b8f6f77ee43690e603a85683 100644
--- a/ash/wm/shelf_layout_manager.cc
+++ b/ash/wm/shelf_layout_manager.cc
@@ -15,6 +15,7 @@
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/status_area_widget.h"
+#include "ash/wm/property_util.h"
 #include "ash/wm/workspace_controller.h"
 #include "ash/wm/workspace/workspace_animations.h"
 #include "base/auto_reset.h"
@@ -257,6 +258,10 @@ void ShelfLayoutManager::UpdateVisibilityState() {
     SetState(SHELF_VISIBLE);
   } else if (gesture_drag_status_ == GESTURE_DRAG_COMPLETE_IN_PROGRESS) {
     SetState(SHELF_AUTO_HIDE);
+  } else if (GetRootWindowController(root_window_)->IsImmersiveMode()) {
+    // The user choosing immersive mode indicates he or she wants to maximize
+    // screen real-estate for content, so always auto-hide the shelf.
+    SetState(SHELF_AUTO_HIDE);
   } else {
     WorkspaceWindowState window_state(workspace_controller_->GetWindowState());
     switch (window_state) {