Use XInput2 events for keyboard events.

ui/aura/window_tree_host_x11.cc

Index: ui/aura/window_tree_host_x11.cc
diff --git a/ui/aura/window_tree_host_x11.cc b/ui/aura/window_tree_host_x11.cc
index 083b6ad3e689bc95219c920e51258690c917f3b4..4bbe32535eebce7edd8a691ad1be57543cb137a2 100644
--- a/ui/aura/window_tree_host_x11.cc
+++ b/ui/aura/window_tree_host_x11.cc
@@ -73,8 +73,6 @@ void SelectXInput2EventsForRootWindow(XDisplay* display, ::Window root_window) {
   memset(mask, 0, sizeof(mask));
 
   XISetMask(mask, XI_HierarchyChanged);
-  XISetMask(mask, XI_KeyPress);
-  XISetMask(mask, XI_KeyRelease);
 
   XIEventMask evmask;
   evmask.deviceid = XIAllDevices;
@@ -417,7 +415,6 @@ uint32_t WindowTreeHostX11::DispatchEvent(const ui::PlatformEvent& event) {
       compositor()->ScheduleRedrawRect(damage_rect);
       break;
     }
-
     case FocusOut:
       if (xev->xfocus.mode != NotifyGrab)
         OnHostLostWindowCapture();
@@ -692,6 +689,12 @@ void WindowTreeHostX11::DispatchXI2Event(const base::NativeEvent& event) {
       SendEventToProcessor(&scrollev);
       break;
     }
+    case ui::ET_KEY_PRESSED:
+    case ui::ET_KEY_RELEASED: {
+      ui::KeyEvent key_event(xev, false);
+      SendEventToProcessor(&key_event);
+      break;
+    }
     case ui::ET_UMA_DATA:
       break;
     case ui::ET_UNKNOWN: