Enable immersive fullscreen on Windows Ash.

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 f13ea079023459d5b94dccd053abe87324ffcd63..d1aeddd4d86c11c28dded762e8c97dac54657935 100644
--- a/ash/shelf/shelf_layout_manager.cc
+++ b/ash/shelf/shelf_layout_manager.cc
@@ -393,19 +393,21 @@ void ShelfLayoutManager::RemoveObserver(ShelfLayoutManagerObserver* observer) {
 // ShelfLayoutManager, Gesture functions:
 
 void ShelfLayoutManager::OnGestureEdgeSwipe(const ui::GestureEvent& gesture) {
-  // Edge swipe should exit fullscreen, show the tray, and disable auto-hide.
-
-  if (workspace_controller_->GetWindowState() ==
-      WORKSPACE_WINDOW_STATE_FULL_SCREEN) {
-    accelerators::ToggleFullscreen();
+  WorkspaceWindowState window_state(workspace_controller_->GetWindowState());
+  if (window_state == WORKSPACE_WINDOW_STATE_FULL_SCREEN) {
+    const aura::Window* fullscreen_window = GetRootWindowController(
+        root_window_)->GetWindowForFullscreenMode();
+    if (wm::GetWindowState(fullscreen_window)->hide_shelf_when_fullscreen())
+      return;
+  } else if (CalculateShelfVisibility() == SHELF_VISIBLE) {
+    // If the shelf is permanently visible, don't make an effort to display it.
+    return;
   }
 
-  ShelfVisibilityState visibility = CalculateShelfVisibility();
-  if (visibility == SHELF_AUTO_HIDE &&
-      CalculateAutoHideState(visibility) == SHELF_AUTO_HIDE_HIDDEN) {
-    SetState(SHELF_VISIBLE);
-    SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_NEVER);
-  }
+  gesture_drag_auto_hide_state_ = SHELF_AUTO_HIDE_SHOWN;
+  gesture_drag_status_ = GESTURE_DRAG_COMPLETE_IN_PROGRESS;
+  SetState(SHELF_AUTO_HIDE);
+  gesture_drag_status_ = GESTURE_DRAG_NONE;
 }
 
 void ShelfLayoutManager::StartGestureDrag(const ui::GestureEvent& gesture) {