Attempt 2: Allows tab dragging when maximized on aura. To fix it I made it so

ash/wm/workspace/workspace_manager.cc

Index: ash/wm/workspace/workspace_manager.cc
diff --git a/ash/wm/workspace/workspace_manager.cc b/ash/wm/workspace/workspace_manager.cc
index 3e8d25a66fbe5e96de0730c5a5d6cd1adf818f58..b278074ab63f8f6d0331738611b19e5f3f341cc8 100644
--- a/ash/wm/workspace/workspace_manager.cc
+++ b/ash/wm/workspace/workspace_manager.cc
@@ -88,7 +88,7 @@ WorkspaceManager::~WorkspaceManager() {
 
 bool WorkspaceManager::IsManagedWindow(aura::Window* window) const {
   return window->type() == aura::client::WINDOW_TYPE_NORMAL &&
-         !window->transient_parent();
+         !window->transient_parent() && ash::GetTrackedByWorkspace(window);
 }
 
 void WorkspaceManager::AddWindow(aura::Window* window) {
@@ -186,10 +186,7 @@ gfx::Rect WorkspaceManager::AlignBoundsToGrid(const gfx::Rect& bounds) {
 void WorkspaceManager::OnWindowPropertyChanged(aura::Window* window,
                                                const void* key,
                                                intptr_t old) {
-  if (!IsManagedWindow(window))
-    return;
-
-  if (key != aura::client::kShowStateKey)
+  if (key != aura::client::kShowStateKey || !IsManagedWindow(window))
     return;
 
   DCHECK(FindBy(window));