Expand WTF::StringView's API to be more like StringPiece.

third_party/WebKit/Source/core/layout/line/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 535 matching lines @@
 
     widths.resize(ranges.size());
     for (unsigned i = 0; i < ranges.size(); i++)
         widths[i] = ranges[i].width();
 }
 
 TextRun InlineTextBox::constructTextRun(const ComputedStyle& style, const Font& font, StringBuilder* charactersWithHyphen) const
 {
     ASSERT(getLineLayoutItem().text());
 
-    StringView string = getLineLayoutItem().text().createView();
+    String string = getLineLayoutItem().text();
     unsigned startPos = start();
     unsigned length = len();
-
-    if (string.length() != length || startPos)
-        string.narrow(startPos, length);
-
-    return constructTextRun(style, font, string, getLineLayoutItem().textLength() - startPos, charactersWithHyphen);
+    return constructTextRun(style, font, StringView(string, startPos, length), getLineLayoutItem().textLength() - startPos, charactersWithHyphen);
 }
 
 TextRun InlineTextBox::constructTextRun(const ComputedStyle& style, const Font& font, StringView string, int maximumLength, StringBuilder* charactersWithHyphen) const
 {
     if (charactersWithHyphen) {
         const AtomicString& hyphenString = style.hyphenString();
         charactersWithHyphen->reserveCapacity(string.length() + hyphenString.length());
         charactersWithHyphen->append(string);
         charactersWithHyphen->append(hyphenString);
-        string = charactersWithHyphen->toString().createView();
+        string = charactersWithHyphen->toString();
         maximumLength = string.length();
     }
 
     ASSERT(maximumLength >= static_cast<int>(string.length()));
 
     TextRun run(string, textPos().toFloat(), expansion(), expansionBehavior(), direction(), dirOverride() || style.rtlOrdering() == VisualOrder);
     run.setTabSize(!style.collapseWhiteSpace(), style.getTabSize());
     run.setTextJustify(style.getTextJustify());
 
     // Propagate the maximum length of the characters buffer to the TextRun, even when we're only processing a substring.
@@ skipping 36 matching lines @@
     printedCharacters = fprintf(stderr, "\t%s %p", obj.name(), obj.debugPointer());
     const int layoutObjectCharacterOffset = 75;
     for (; printedCharacters < layoutObjectCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace blink