OnPreeditChanged should update the internal composition after checking it.

ui/base/ime/input_method_auralinux.cc

Index: ui/base/ime/input_method_auralinux.cc
diff --git a/ui/base/ime/input_method_auralinux.cc b/ui/base/ime/input_method_auralinux.cc
index b4d436af403352c0723e4823bfdb00e667636af6..bf201d0aa2025560cff272895e7f0c6dd0ed9ae7 100644
--- a/ui/base/ime/input_method_auralinux.cc
+++ b/ui/base/ime/input_method_auralinux.cc
@@ -243,8 +243,6 @@ void InputMethodAuraLinux::OnPreeditChanged(
   if (suppress_next_result_ || IsTextInputTypeNone())
     return;
 
-  composition_ = composition_text;
-
   if (is_sync_mode_) {
     if (!composition_.text.empty() || !composition_text.text.empty())
       composition_changed_ = true;
@@ -252,6 +250,8 @@ void InputMethodAuraLinux::OnPreeditChanged(
     SendFakeProcessKeyEvent(0);
     GetTextInputClient()->SetCompositionText(composition_text);
   }
+
+  composition_ = composition_text;
 }
 
 void InputMethodAuraLinux::OnPreeditEnd() {