Avoid merging SharedBuffer segments in TextResource::decodedText

third_party/WebKit/Source/core/fetch/TextResource.cpp

 // Copyright 2014 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 "config.h"
 #include "core/fetch/TextResource.h"
 
 #include "core/html/parser/TextResourceDecoder.h"
 #include "platform/SharedBuffer.h"
+#include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 TextResource::TextResource(const ResourceRequest& resourceRequest, Resource::Type type, const String& mimeType, const String& charset)
     : Resource(resourceRequest, type)
     , m_decoder(TextResourceDecoder::create(mimeType, charset))
 {
 }
 
 TextResource::~TextResource()
 {
 }
 
 void TextResource::setEncoding(const String& chs)
 {
     m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
 }
 
 String TextResource::encoding() const
 {
     return m_decoder->encoding().name();
 }
 
 String TextResource::decodedText() const
 {
     ASSERT(m_data);
 
-    String text = m_decoder->decode(m_data->data(), encodedSize());
-    text.append(m_decoder->flush());
-    return text;
+    StringBuilder builder;
+    const char* data;
+    unsigned position = 0;
+    while (unsigned length = m_data->getSomeData(data, position)) {
+        builder.append(m_decoder->decode(data, length));
+        position += length;
+    }
+    builder.append(m_decoder->flush());
+    return builder.toString();
 }
 
 } // namespace blink