Selection Action mode triggered like a context menu

third_party/WebKit/Source/core/events/MouseEvent.cpp

Index: third_party/WebKit/Source/core/events/MouseEvent.cpp
diff --git a/third_party/WebKit/Source/core/events/MouseEvent.cpp b/third_party/WebKit/Source/core/events/MouseEvent.cpp
index 62b5aed35452405c407653f38f16c6c999ff5d6b..76969561df1ba208959f2a4fb03b5f0430c84da6 100644
--- a/third_party/WebKit/Source/core/events/MouseEvent.cpp
+++ b/third_party/WebKit/Source/core/events/MouseEvent.cpp
@@ -176,13 +176,17 @@ MouseEvent::MouseEvent(const AtomicString& event_type,
       button_(static_cast<short>(event.button)),
       buttons_(WebInputEventModifiersToButtons(event.GetModifiers())),
       related_target_(related_target),
-      synthetic_event_type_(event.FromTouch() ? kFromTouch
-                                              : kRealOrIndistinguishable),
       region_(region) {
   IntPoint root_frame_coordinates =
       FlooredIntPoint(event.PositionInRootFrame());
   InitCoordinatesFromRootFrame(root_frame_coordinates.X(),
                                root_frame_coordinates.Y());
+  if (event.GetModifiers() & WebInputEvent::kSelectAll)
+    synthetic_event_type_ = kFromSelectAll;
+  else if (event.FromTouch())
+    synthetic_event_type_ = kFromTouch;
+  else
+    synthetic_event_type_ = kRealOrIndistinguishable;
 }
 
 MouseEvent::MouseEvent(const AtomicString& event_type,