Relands fixes for 106432, 107287 and 107401. These got reverted

ui/aura_shell/toplevel_layout_manager.cc

Index: ui/aura_shell/toplevel_layout_manager.cc
diff --git a/ui/aura_shell/toplevel_layout_manager.cc b/ui/aura_shell/toplevel_layout_manager.cc
index 05d5f474c23de0cebb1c12be25236c296ed5cd6d..00b44aa0bce7d2717100a631369bb6827f26fcee 100644
--- a/ui/aura_shell/toplevel_layout_manager.cc
+++ b/ui/aura_shell/toplevel_layout_manager.cc
@@ -48,7 +48,14 @@ void ToplevelLayoutManager::OnChildWindowVisibilityChanged(aura::Window* child,
 
 void ToplevelLayoutManager::SetChildBounds(aura::Window* child,
                                            const gfx::Rect& requested_bounds) {
-  SetChildBoundsDirect(child, requested_bounds);
+  const static int kTitleHeight = 12;
+  gfx::Rect child_bounds(requested_bounds);
+  gfx::Rect work_area = gfx::Screen::GetMonitorWorkAreaNearestWindow(child);
+  if (child_bounds.y() < 0)
+    child_bounds.set_y(0);
+  else if (child_bounds.y() + kTitleHeight > work_area.bottom())
+    child_bounds.set_y(work_area.bottom() - kTitleHeight);
+  SetChildBoundsDirect(child, child_bounds);
 }
 
 void ToplevelLayoutManager::OnWindowPropertyChanged(aura::Window* window,