Fix the issue of cursor being shown at startup.

ash/magnifier/magnification_controller.cc

Index: ash/magnifier/magnification_controller.cc
diff --git a/ash/magnifier/magnification_controller.cc b/ash/magnifier/magnification_controller.cc
index ce5e4fea1a16176d465515ffafff2369eb4983e4..e9d8937fbab40557c098036f19f0962e662dc0ef 100644
--- a/ash/magnifier/magnification_controller.cc
+++ b/ash/magnifier/magnification_controller.cc
@@ -370,6 +370,8 @@ void MagnificationControllerImpl::ValidateScale(float* scale) {
 }
 
 void MagnificationControllerImpl::OnImplicitAnimationsCompleted() {
+  if (!is_on_zooming_)
+    return;
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(root_window_);
   if (cursor_client)