[Ozone] Constrain the cursor when overscan insets are set

ui/aura/window_tree_host_ozone.h

Index: ui/aura/window_tree_host_ozone.h
diff --git a/ui/aura/window_tree_host_ozone.h b/ui/aura/window_tree_host_ozone.h
index 716ff7a83c24b6b15fec663ee7f610c706c3d9f9..e4fcd02d936ee0ed921a4d381aa245a48c95658e 100644
--- a/ui/aura/window_tree_host_ozone.h
+++ b/ui/aura/window_tree_host_ozone.h
@@ -26,7 +26,20 @@ class AURA_EXPORT WindowTreeHostOzone : public WindowTreeHost,
 
  protected:
   // WindowTreeHost:
+  ui::EventSource* GetEventSource() override;
+  gfx::AcceleratedWidget GetAcceleratedWidget() override;
+  void Show() override;
+  void Hide() override;
   gfx::Rect GetBounds() const override;
+  void SetBounds(const gfx::Rect& bounds) override;
+  gfx::Point GetLocationOnNativeScreen() const override;
+  void SetCapture() override;
+  void ReleaseCapture() override;
+  void SetCursorNative(gfx::NativeCursor cursor_type) override;
+  void MoveCursorToNative(const gfx::Point& location) override;
+  void OnCursorVisibilityChangedNative(bool show) override;
+
+  ui::PlatformWindow* platform_window() { return platform_window_.get(); }
 
  private:
   // ui::PlatformWindowDelegate:
@@ -40,19 +53,6 @@ class AURA_EXPORT WindowTreeHostOzone : public WindowTreeHost,
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override;
   void OnActivationChanged(bool active) override;
 
-  // WindowTreeHost:
-  ui::EventSource* GetEventSource() override;
-  gfx::AcceleratedWidget GetAcceleratedWidget() override;
-  void Show() override;
-  void Hide() override;
-  void SetBounds(const gfx::Rect& bounds) override;
-  gfx::Point GetLocationOnNativeScreen() const override;
-  void SetCapture() override;
-  void ReleaseCapture() override;
-  void SetCursorNative(gfx::NativeCursor cursor_type) override;
-  void MoveCursorToNative(const gfx::Point& location) override;
-  void OnCursorVisibilityChangedNative(bool show) override;
-
   // ui::EventSource overrides.
   ui::EventProcessor* GetEventProcessor() override;