Move CompositionUnderlineVectorBuilder.* from web/ -> core/editing/.

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"
 
+#include "public/web/WebCompositionUnderline.h"
+
 namespace blink {
 
 CompositionUnderline::CompositionUnderline(unsigned start_offset,
                                            unsigned end_offset,
                                            const Color& color,
                                            bool thick,
                                            const Color& background_color)
     : color_(color), thick_(thick), background_color_(background_color) {
   // Sanitize offsets by ensuring a valid range corresponding to the last
   // possible position.
   // TODO(wkorman): Consider replacing with DCHECK_LT(startOffset, endOffset).
   start_offset_ =
       std::min(start_offset, std::numeric_limits<unsigned>::max() - 1u);
   end_offset_ = std::max(start_offset_ + 1u, end_offset);
 }
 
+CompositionUnderline::CompositionUnderline(
+    const WebCompositionUnderline& underline)
+    : CompositionUnderline(underline.start_offset,
+                           underline.end_offset,
+                           Color(underline.color),
+                           underline.thick,
+                           Color(underline.background_color)) {}
 }  // namespace blink