Ignore update cursor messages from blink when the cursor position lies outside our root window

ui/gfx/screen_win.h

Index: ui/gfx/screen_win.h
diff --git a/ui/gfx/screen_win.h b/ui/gfx/screen_win.h
index 9ece286e919750ac1e1ec8bf167d4548aeec364f..0705d12bd528d15b14692a7fbcaaad426d03677a 100644
--- a/ui/gfx/screen_win.h
+++ b/ui/gfx/screen_win.h
@@ -19,6 +19,12 @@ class GFX_EXPORT ScreenWin : public Screen {
   ScreenWin();
   ~ScreenWin() override;
 
+  // Returns the HWND associated with the NativeView.
+  virtual HWND GetHWNDFromNativeView(NativeView window) const;
+
+  // Returns the NativeView associated with the HWND.
+  virtual NativeWindow GetNativeWindowFromHWND(HWND hwnd) const;
+
  protected:
   // Overridden from gfx::Screen:
   gfx::Point GetCursorScreenPoint() override;
@@ -33,12 +39,6 @@ class GFX_EXPORT ScreenWin : public Screen {
   void AddObserver(DisplayObserver* observer) override;
   void RemoveObserver(DisplayObserver* observer) override;
 
-  // Returns the HWND associated with the NativeView.
-  virtual HWND GetHWNDFromNativeView(NativeView window) const;
-
-  // Returns the NativeView associated with the HWND.
-  virtual NativeWindow GetNativeWindowFromHWND(HWND hwnd) const;
-
  private:
   void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);