Manually compute inverted matrix for screen rotation

ui/base/events/event.h

Index: ui/base/events/event.h
diff --git a/ui/base/events/event.h b/ui/base/events/event.h
index a61d5dca207596884df3636f7e39673e568ce014..a040f9574b1ba9cebb02682d82633f383c200a2b 100644
--- a/ui/base/events/event.h
+++ b/ui/base/events/event.h
@@ -269,9 +269,10 @@ class UI_EXPORT LocatedEvent : public Event {
   }
   const gfx::Point& system_location() const { return system_location_; }
 
-  // Applies |root_transform| to the event.
+  // Transform the locations using |inverted_root_transform|.
   // This is applied to both |location_| and |root_location_|.
-  virtual void UpdateForRootTransform(const gfx::Transform& root_transform);
+  virtual void UpdateForRootTransform(
+      const gfx::Transform& inverted_root_transform);
 
   template <class T> void ConvertLocationToTarget(T* source, T* target) {
     if (target && target != source)