[Ozone] Constrain the cursor when overscan insets are set

ui/platform_window/platform_window.h

 // Copyright 2014 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.
 
 #ifndef UI_PLATFORM_WINDOW_PLATFORM_WINDOW_H_
 #define UI_PLATFORM_WINDOW_PLATFORM_WINDOW_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/cursor/cursor.h"
 
@@ skipping 24 matching lines @@
 
   virtual void SetCapture() = 0;
   virtual void ReleaseCapture() = 0;
 
   virtual void ToggleFullscreen() = 0;
   virtual void Maximize() = 0;
   virtual void Minimize() = 0;
   virtual void Restore() = 0;
 
   virtual void SetCursor(PlatformCursor cursor) = 0;
+
+  // Moves the cursor to |location|. Location is in platform window coordinates.
   virtual void MoveCursorTo(const gfx::Point& location) = 0;
+
+  // Confines the cursor to |bounds| when it is in the platform window. |bounds|
+  // is in platform window coordinates.
+  virtual void ConfineCursorToBounds(const gfx::Rect& bounds) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_PLATFORM_WINDOW_PLATFORM_WINDOW_H_