Add pointer id to the WebMouseEvent's constructors

content/common/input/synthetic_web_input_event_builders.cc

Index: content/common/input/synthetic_web_input_event_builders.cc
diff --git a/content/common/input/synthetic_web_input_event_builders.cc b/content/common/input/synthetic_web_input_event_builders.cc
index 5e5638e6c3b7d9872f071cfbd2a5b19b1d31dab9..ecf30b40ecb1013a66ab63328cc1576d7ddd2e15 100644
--- a/content/common/input/synthetic_web_input_event_builders.cc
+++ b/content/common/input/synthetic_web_input_event_builders.cc
@@ -38,7 +38,7 @@ WebMouseEvent SyntheticWebMouseEventBuilder::Build(
   result.SetPositionInWidget(window_x, window_y);
   result.SetModifiers(modifiers);
   result.pointer_type = pointer_type;
-  result.id = ui::MouseEvent::kMousePointerId;
+  result.id = ui::MouseEvent::kDefaultMousePointerId;
   return result;
 }