Hide mouse cursor when screenshot is taking

ui/snapshot/screenshot_grabber.cc

Index: ui/snapshot/screenshot_grabber.cc
diff --git a/ui/snapshot/screenshot_grabber.cc b/ui/snapshot/screenshot_grabber.cc
index 4534a857b4beab8a5b77dc15a825a6098b8a508e..069cc5dfe043fc7dce0597e734534a6a5667d4a2 100644
--- a/ui/snapshot/screenshot_grabber.cc
+++ b/ui/snapshot/screenshot_grabber.cc
@@ -24,6 +24,7 @@
 #include "ui/snapshot/snapshot.h"
 
 #if defined(USE_AURA)
+#include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window.h"
 #endif
 
@@ -134,6 +135,11 @@ void ScreenshotGrabber::TakeScreenshot(gfx::NativeWindow window,
   aura::Window* aura_window = static_cast<aura::Window*>(window);
   is_partial = rect.size() != aura_window->bounds().size();
   window_identifier = aura_window->GetBoundsInScreen().ToString();
+
+  aura::client::CursorClient* cursor_client =
+      aura::client::GetCursorClient(aura_window->GetRootWindow());
+  if (cursor_client)
+    cursor_client->HideCursor();
 #endif
   ui::GrabWindowSnapshotAsync(
       window, rect, blocking_task_runner_,