Constructors for ui::MouseEvent/ui::TouchEvent from ui::PointerEvent.

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index 34944fd78296825013486e4fec87c8c3cc96b7ba..114d73ad320cd7fdfe2753c397b0669f8c4a4f9e 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -465,6 +465,9 @@ class EVENTS_EXPORT MouseEvent : public LocatedEvent {
  public:
   explicit MouseEvent(const base::NativeEvent& native_event);
 
+  // |pointer_event.IsMousePointerEvent()| must be true.
+  explicit MouseEvent(const PointerEvent& pointer_event);
+
   // Create a new MouseEvent based on the provided model.
   // Uses the provided |type| and |flags| for the new event.
   // If source / target windows are provided, the model location will be
@@ -640,6 +643,9 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
  public:
   explicit TouchEvent(const base::NativeEvent& native_event);
 
+  // |pointer_event.IsTouchPointerEvent()| must be true.
+  explicit TouchEvent(const PointerEvent& pointer_event);
+
   // Create a new TouchEvent which is identical to the provided model.
   // If source / target windows are provided, the model location will be
   // converted from |source| coordinate system to |target| coordinate system.