Add id properties to PointerEvent

ui/events/mojo/struct_traits_unittest.cc

Index: ui/events/mojo/struct_traits_unittest.cc
diff --git a/ui/events/mojo/struct_traits_unittest.cc b/ui/events/mojo/struct_traits_unittest.cc
index 0f3fb7f81267e533b255ee63c9e6de114825f88c..85a88f9d349f7e202a4a233d642368fcffd502a3 100644
--- a/ui/events/mojo/struct_traits_unittest.cc
+++ b/ui/events/mojo/struct_traits_unittest.cc
@@ -199,7 +199,8 @@ TEST_F(StructTraitsTest, PointerEvent) {
     EXPECT_EQ(kTestData[i].flags(), output_ptr_event->flags());
     EXPECT_EQ(kTestData[i].location(), output_ptr_event->location());
     EXPECT_EQ(kTestData[i].root_location(), output_ptr_event->root_location());
-    EXPECT_EQ(kTestData[i].pointer_id(), output_ptr_event->pointer_id());
+    EXPECT_EQ(kTestData[i].pointer_details().id,
+              output_ptr_event->pointer_details().id);
     EXPECT_EQ(kTestData[i].changed_button_flags(),
               output_ptr_event->changed_button_flags());
     EXPECT_EQ(kTestData[i].pointer_details(),