Hide mouse cursor when screenshot is taking

ui/snapshot/screenshot_grabber.h

Index: ui/snapshot/screenshot_grabber.h
diff --git a/ui/snapshot/screenshot_grabber.h b/ui/snapshot/screenshot_grabber.h
index 4484be62161ef161306c3ccb5c2d5eac60987ada..555f863d870ba2042d1d2e044583591a7ed14966 100644
--- a/ui/snapshot/screenshot_grabber.h
+++ b/ui/snapshot/screenshot_grabber.h
@@ -76,6 +76,10 @@ class SNAPSHOT_EXPORT ScreenshotGrabber {
   bool HasObserver(const ScreenshotGrabberObserver* observer) const;
 
  private:
+#if defined(USE_AURA)
+  class ScopedCursorHider;
+#endif
+
   void GrabWindowSnapshotAsyncCallback(
       const std::string& window_identifier,
       base::FilePath screenshot_path,
@@ -91,6 +95,11 @@ class SNAPSHOT_EXPORT ScreenshotGrabber {
   // Task runner for blocking tasks.
   scoped_refptr<base::TaskRunner> blocking_task_runner_;
 
+#if defined(USE_AURA)
+  // The object to hide cursor when taking screenshot.
+  std::unique_ptr<ScopedCursorHider> cursor_hider_;
+#endif
+
   base::ObserverList<ScreenshotGrabberObserver> observers_;
   base::WeakPtrFactory<ScreenshotGrabber> factory_;