Add id properties to PointerEvent

ui/events/event.cc

Index: ui/events/event.cc
diff --git a/ui/events/event.cc b/ui/events/event.cc
index 879f3e1e96647fb0447e0012c00bbef6195d0401..5d0589f1ef00b9c1488a68eef29718449b681d67 100644
--- a/ui/events/event.cc
+++ b/ui/events/event.cc
@@ -501,6 +501,44 @@ void LocatedEvent::UpdateForRootTransform(
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// PointerDetails
+
+PointerDetails::PointerDetails() {}
+
+PointerDetails::PointerDetails(EventPointerType pointer_type)
+    : pointer_type(pointer_type),
+      force(std::numeric_limits<float>::quiet_NaN()) {}
+
+PointerDetails::PointerDetails(EventPointerType pointer_type,
+                               float radius_x,
+                               float radius_y,
+                               float force,
+                               float tilt_x,
+                               float tilt_y,
+                               float tangential_pressure,
+                               int twist,
+                               uint32_t id)
+    : pointer_type(pointer_type),
+      // If we aren't provided with a radius on one axis, use the
+      // information from the other axis.
+      radius_x(radius_x > 0 ? radius_x : radius_y),
+      radius_y(radius_y > 0 ? radius_y : radius_x),
+      force(force),
+      tilt_x(tilt_x),
+      tilt_y(tilt_y),
+      tangential_pressure(tangential_pressure),
+      twist(twist),
+      id(id) {}
+
+PointerDetails::PointerDetails(EventPointerType pointer_type,
+                               const gfx::Vector2d& offset)
+    : pointer_type(pointer_type),
+      force(std::numeric_limits<float>::quiet_NaN()),
+      offset(offset) {}
+
+PointerDetails::PointerDetails(const PointerDetails& other) = default;
+
+////////////////////////////////////////////////////////////////////////////////
 // MouseEvent
 
 MouseEvent::MouseEvent(const base::NativeEvent& native_event)