OnPreeditChanged should update the internal composition after checking it.

ui/base/ime/input_method_auralinux_unittest.cc

 // Copyright 2015 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/memory/singleton.h"
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 588 matching lines @@
 
   KeyEvent key(ET_KEY_PRESSED, VKEY_A, 0);
   key.set_character(L'a');
   input_method_auralinux_->DispatchKeyEvent(key);
 
   test_result_->ExpectAction("keydown:229");
   test_result_->ExpectAction("textinput:b");
   test_result_->ExpectAction("compositionstart");
   test_result_->ExpectAction("compositionupdate:a");
   test_result_->Verify();
+
+  // crbug.com/513124.
+  context_->SetSyncMode(true);
+  context_->SetEatKey(true);
+  context_->AddCommitAction("c");
+  context_->AddCompositionUpdateAction("");
+  input_method_auralinux_->DispatchKeyEvent(key);
+
+  test_result_->ExpectAction("keydown:229");
+  test_result_->ExpectAction("compositionend");
+  test_result_->ExpectAction("textinput:c");
+  test_result_->Verify();
 }
 
 TEST_F(InputMethodAuraLinuxTest, MixedAsyncAndSyncTest) {
   context_->SetSyncMode(false);
   context_->SetEatKey(true);
 
   scoped_ptr<TextInputClientForTesting> client(
       new TextInputClientForTesting(TEXT_INPUT_TYPE_TEXT));
   input_method_auralinux_->SetFocusedTextInputClient(client.get());
   input_method_auralinux_->OnTextInputTypeChanged(client.get());
@@ skipping 94 matching lines @@
   input_method_auralinux_->DispatchKeyEvent(key);
 
   test_result_->ExpectAction("textinput:c");
   test_result_->ExpectAction("keydown:65");
   test_result_->ExpectAction("keypress:65");
   test_result_->Verify();
 }
 
 }  // namespace
 }  // namespace ui