Add support for persisting CompositionUnderlines in InputMethodController

third_party/WebKit/Source/core/editing/CompositionUnderline.cpp

 // Copyright 2016 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 "core/editing/CompositionUnderline.h"
 
 namespace blink {
 
 CompositionUnderline::CompositionUnderline(unsigned startOffset,
                                            unsigned endOffset,
                                            const Color& color,
                                            bool thick,
-                                           const Color& backgroundColor)
-    : m_color(color), m_thick(thick), m_backgroundColor(backgroundColor) {
+                                           const Color& backgroundColor,
+                                           bool persist)
+    : m_color(color),
+      m_thick(thick),
+      m_backgroundColor(backgroundColor),
+      m_persist(persist) {
   // Sanitize offsets by ensuring a valid range corresponding to the last
   // possible position.
   // TODO(wkorman): Consider replacing with DCHECK_LT(startOffset, endOffset).
   m_startOffset =
       std::min(startOffset, std::numeric_limits<unsigned>::max() - 1u);
   m_endOffset = std::max(m_startOffset + 1u, endOffset);
 }
 
 }  // namespace blink