Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/platform_window/platform_window.h

Index: ui/platform_window/platform_window.h
diff --git a/ui/platform_window/platform_window.h b/ui/platform_window/platform_window.h
index a224f5a4325c877a686507cf7c9d9cda6c5cd4bd..bfeda6b02093d01c7ecb42be8b7a2d94fce507b6 100644
--- a/ui/platform_window/platform_window.h
+++ b/ui/platform_window/platform_window.h
@@ -18,6 +18,7 @@ typedef unsigned long PlatformCursor;
 #else
 typedef void* PlatformCursor;
 #endif
+  
 
 class PlatformWindowDelegate;
 
@@ -47,7 +48,13 @@ class PlatformWindow {
   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