OnPreeditChanged should update the internal composition after checking it.

ui/base/ime/input_method_auralinux.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/ime/input_method_auralinux.h"
 
 #include "base/auto_reset.h"
 #include "base/environment.h"
 #include "ui/base/ime/linux/linux_input_method_context_factory.h"
 #include "ui/base/ime/text_input_client.h"
@@ skipping 225 matching lines @@
     GetTextInputClient()->InsertText(text);
     composition_.Clear();
   }
 }
 
 void InputMethodAuraLinux::OnPreeditChanged(
     const CompositionText& composition_text) {
   if (suppress_next_result_ || IsTextInputTypeNone())
     return;
 
-  composition_ = composition_text;
-
   if (is_sync_mode_) {
     if (!composition_.text.empty() || !composition_text.text.empty())
       composition_changed_ = true;
   } else {
     SendFakeProcessKeyEvent(0);
     GetTextInputClient()->SetCompositionText(composition_text);
   }
+
+  composition_ = composition_text;
 }
 
 void InputMethodAuraLinux::OnPreeditEnd() {
   if (suppress_next_result_ || IsTextInputTypeNone())
     return;
 
   if (is_sync_mode_) {
     if (!composition_.text.empty()) {
       composition_.Clear();
       composition_changed_ = true;
@@ skipping 59 matching lines @@
 
 void InputMethodAuraLinux::ConfirmCompositionText() {
   TextInputClient* client = GetTextInputClient();
   if (client && client->HasCompositionText())
     client->ConfirmCompositionText();
 
   ResetContext();
 }
 
 }  // namespace ui