[Line Layout API] Convert SVGTextLayoutEngine and SVGTextLayoutEngineBaseline to line Layout API

third_party/WebKit/Source/core/layout/api/LineLayoutText.h

 // 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.
 
 #ifndef LineLayoutText_h
 #define LineLayoutText_h
 
 #include "core/layout/LayoutText.h"
 #include "core/layout/api/LineLayoutItem.h"
 #include "platform/LayoutUnit.h"
@@ skipping 49 matching lines @@
     UChar characterAt(unsigned offset) const
     {
         return toText()->characterAt(offset);
     }
 
     UChar uncheckedCharacterAt(unsigned offset) const
     {
         return toText()->uncheckedCharacterAt(offset);
     }
 
+    UChar32 codepointAt(unsigned offset) const
+    {
+        return toText()->codepointAt(offset);
+    }
+
     bool is8Bit() const
     {
         return toText()->is8Bit();
     }
 
     const LChar* characters8() const
     {
         return toText()->characters8();
     }
 
@@ skipping 58 matching lines @@
     }
 
 private:
     LayoutText* toText() { return toLayoutText(layoutObject()); }
     const LayoutText* toText() const { return toLayoutText(layoutObject()); }
 };
 
 } // namespace blink
 
 #endif // LineLayoutText_h