In mushrome, keep the state of the cursor locally.

ash/wm/native_cursor_manager_ash_mus.cc

Index: ash/wm/native_cursor_manager_ash_mus.cc
diff --git a/ash/wm/native_cursor_manager_ash_mus.cc b/ash/wm/native_cursor_manager_ash_mus.cc
index 279ae7e4ec87309a6ee7c1b644004c47ba4b3af2..860126d75087a6fd922b4d94c88be4700b7746e3 100644
--- a/ash/wm/native_cursor_manager_ash_mus.cc
+++ b/ash/wm/native_cursor_manager_ash_mus.cc
@@ -44,6 +44,13 @@ void SetCursorOnAllRootWindows(gfx::NativeCursor cursor) {
   // event targeting issue.
   ShellPort::Get()->SetGlobalOverrideCursor(mojo_cursor);
 
+  // Make sure the local state is set properly, so that local queries show that
+  // we set the cursor.
+  aura::Window::Windows root_windows = Shell::Get()->GetAllRootWindows();
+  for (aura::Window::Windows::iterator iter = root_windows.begin();

[sky, 2017/06/23 23:31:28]

for (aura::Window* root : Shell::Get()->GetAllRootWindows())

+       iter != root_windows.end(); ++iter)
+    (*iter)->GetHost()->SetCursor(cursor);
+
   Shell::Get()
       ->window_tree_host_manager()
       ->cursor_window_controller()