[WIP][b:eae_mywip_paint] Paint Selection NG.

third_party/WebKit/Source/core/layout/ng/inline/ng_inline_items_builder.cc

 // 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/layout/ng/inline/ng_inline_items_builder.h"
 
 #include "core/layout/LayoutObject.h"
 #include "core/layout/ng/inline/ng_inline_node.h"
 #include "core/style/ComputedStyle.h"
 
@@ skipping 139 matching lines @@
   unsigned start_offset = text_.length();
   for (unsigned i = start; i < end;) {
     UChar c = string[i];
     if (c == kNewlineCharacter) {
       // LayoutBR does not set preserve_newline, but should be preserved.
       if (!i && end == 1 && layout_object && layout_object->IsBR()) {
         AppendForcedBreak(style, layout_object);
         return;
       }
 
-      if (last_collapsible_space_ == CollapsibleSpace::kNone)
+      if (last_collapsible_space_ == CollapsibleSpace::kNone) {
         text_.Append(kSpaceCharacter);
+      }
       last_collapsible_space_ = CollapsibleSpace::kNewline;
+      if (offset_mapping_)
+        offset_mapping_->push_back(text_.length());
       i++;
       continue;
     }
 
     if (c == kSpaceCharacter || c == kTabulationCharacter) {
       if (last_collapsible_space_ == CollapsibleSpace::kNone) {
         text_.Append(kSpaceCharacter);
         last_collapsible_space_ = CollapsibleSpace::kSpace;
       }
+      if (offset_mapping_)
+        offset_mapping_->push_back(text_.length());
       i++;
       continue;
     }
 
     if (last_collapsible_space_ == CollapsibleSpace::kNewline) {
       RemoveTrailingCollapsibleNewlineIfNeeded(&start_offset, string, i, style);
     }
 
     size_t end_of_non_space = string.Find(IsCollapsibleSpace, i + 1);
     if (end_of_non_space == kNotFound)
       end_of_non_space = string.length();
     text_.Append(string, i, end_of_non_space - i);
+    if (offset_mapping_) {

[kojii, 2017/06/16 11:25:56]

Changes in this file is not for review, correct?

+      size_t apend_size = end_of_non_space - i;
+      for (size_t k = 0; k < apend_size; k++)
+        offset_mapping_->push_back(text_.length() - apend_size + k + 1);
+    }
+
     i = end_of_non_space;
     last_collapsible_space_ = CollapsibleSpace::kNone;
   }
 
   if (text_.length() > start_offset) {
     AppendItem(items_, NGInlineItem::kText, start_offset, text_.length(), style,
                layout_object);
   }
 }
 
@@ skipping 228 matching lines @@
 }
 
 void NGInlineItemsBuilder::Exit(LayoutObject* node) {
   while (!exits_.IsEmpty() && exits_.back().node == node) {
     Append(NGInlineItem::kBidiControl, exits_.back().character);
     exits_.pop_back();
   }
 }
 
 }  // namespace blink