Fix the issue of cursor being shown at startup.

ash/magnifier/magnification_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/magnifier/magnification_controller.h"
 
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 352 matching lines @@
 
   // Adjust the scale to just |kMinMagnifiedScale| if scale is bigger than
   // |kMinMagnifiedScaleThreshold|;
   if (*scale > kMaxMagnifiedScaleThreshold)
     *scale = kMaxMagnifiedScale;
 
   DCHECK(kNonMagnifiedScale <= *scale && *scale <= kMaxMagnifiedScale);
 }
 
 void MagnificationControllerImpl::OnImplicitAnimationsCompleted() {
+  if (!is_on_zooming_)
+    return;
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(root_window_);
   if (cursor_client)
     cursor_client->ShowCursor(true);
   is_on_zooming_ = false;
 }
 
 void MagnificationControllerImpl::SwitchTargetRootWindow(
     aura::RootWindow* new_root_window) {
   if (new_root_window == root_window_)
@@ skipping 116 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // MagnificationController:
 
 // static
 MagnificationController* MagnificationController::CreateInstance() {
   return new MagnificationControllerImpl();
 }
 
 }  // namespace internal
 }  // namespace ash