Add modifier flags to MotionEvent

ui/events/gesture_detection/motion_event_generic_unittest.cc

Index: ui/events/gesture_detection/motion_event_generic_unittest.cc
diff --git a/ui/events/gesture_detection/motion_event_generic_unittest.cc b/ui/events/gesture_detection/motion_event_generic_unittest.cc
index 5c5866a31c21a28a35ae32e54de3cfe211e5003d..f1aa2937deb664807cce49ac7fa00fad9249ecbd 100644
--- a/ui/events/gesture_detection/motion_event_generic_unittest.cc
+++ b/ui/events/gesture_detection/motion_event_generic_unittest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/events/event_constants.h"
 #include "ui/events/gesture_detection/motion_event_generic.h"
 
 namespace ui {
@@ -38,6 +39,9 @@ TEST(MotionEventGenericTest, Basic) {
   event.set_button_state(MotionEvent::BUTTON_PRIMARY);
   EXPECT_EQ(MotionEvent::BUTTON_PRIMARY, event.GetButtonState());
 
+  event.set_flags(EF_ALT_DOWN | EF_SHIFT_DOWN);
+  EXPECT_EQ(EF_ALT_DOWN | EF_SHIFT_DOWN, event.GetFlags());
+
   event.set_action_index(1);
   EXPECT_EQ(1, event.GetActionIndex());
 }