Enable ServerTiming support

third_party/WebKit/Source/platform/network/HTTPParsers.cpp

 /*
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 858 matching lines @@
 
 bool ParseContentRangeHeaderFor206(const String& content_range,
                                    int64_t* first_byte_position,
                                    int64_t* last_byte_position,
                                    int64_t* instance_length) {
   return net::HttpUtil::ParseContentRangeHeaderFor206(
       StringUTF8Adaptor(content_range).AsStringPiece(), first_byte_position,
       last_byte_position, instance_length);
 }
 
+template <typename CharType>
+inline bool IsNotServerTimingHeaderDelimiter(CharType c) {
+  return c != '=' && c != ';' && c != ',';
+}
+
+const LChar* ParseServerTimingToken(const LChar* begin,
+                                    const LChar* end,
+                                    String& result) {
+  const LChar* position = begin;
+  skipWhile<LChar, IsNotServerTimingHeaderDelimiter>(position, end);
+  result = String(begin, position - begin).StripWhiteSpace();
+  return position;
+}
+
+String CheckDoubleQuotedString(const String& value) {
+  if (value.length() < 2 || value[0] != '"' ||
+      value[value.length() - 1] != '"') {
+    return value;
+  }
+
+  StringBuilder out;
+  unsigned pos = 1;                   // Begin after the opening DQUOTE.
+  unsigned len = value.length() - 1;  // End before the closing DQUOTE.
+
+  // Skip past backslashes, but include everything else.
+  while (pos < len) {
+    if (value[pos] == '\\')
+      pos++;
+    if (pos < len)
+      out.Append(value[pos++]);
+  }
+
+  return out.ToString();
+}
+
+std::unique_ptr<ServerTimingHeaderVector> ParseServerTimingHeader(
+    const String& headerValue) {
+  std::unique_ptr<ServerTimingHeaderVector> headers =
+      WTF::MakeUnique<ServerTimingHeaderVector>();
+
+  if (!headerValue.IsNull()) {
+    DCHECK(headerValue.Is8Bit());
+
+    const LChar* position = headerValue.Characters8();
+    const LChar* end = position + headerValue.length();
+    while (position < end) {
+      String metric, value, description = "";
+      position = ParseServerTimingToken(position, end, metric);
+      if (*position == '=') {
+        position = ParseServerTimingToken(position + 1, end, value);
+      }
+      if (*position == ';') {
+        position = ParseServerTimingToken(position + 1, end, description);
+      }
+      position++;
+
+      headers->push_back(WTF::MakeUnique<ServerTimingHeader>(
+          metric, value.ToDouble(), CheckDoubleQuotedString(description)));
+    }
+  }
+  return headers;
+}
+
 }  // namespace blink