aura-linux: Supports deadkey + shift + alphabet for XIM.

ui/events/x/events_x.cc

Index: ui/events/x/events_x.cc
diff --git a/ui/events/x/events_x.cc b/ui/events/x/events_x.cc
index 9d6b15a2eca3a0dc71a833999707b1385c79e011..73cbc4ec5fb663be283036ab50152113d96b4aa1 100644
--- a/ui/events/x/events_x.cc
+++ b/ui/events/x/events_x.cc
@@ -166,8 +166,10 @@ int GetEventFlagsFromXKeyEvent(XEvent* xevent) {
   //
   // We have to send these fabricated key events to XIM so it can correctly
   // handle the character compositions.
+  const unsigned int shift_lock_mask = ShiftMask | LockMask;
   const bool fabricated_by_xim =
-      xevent->xkey.keycode == 0 && xevent->xkey.state == 0;
+      xevent->xkey.keycode == 0 &&
+      (xevent->xkey.state & ~shift_lock_mask) == 0;
   const int ime_fabricated_flag =
       fabricated_by_xim ? ui::EF_IME_FABRICATED_KEY : 0;
 #endif