Add a function to escape a query part of url

net/base/escape.h

 // Copyright (c) 2012 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 NET_BASE_ESCAPE_H_
 #define NET_BASE_ESCAPE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 36 matching lines @@
 NET_EXPORT std::string EscapeExternalHandlerValue(const std::string& text);
 
 // Appends the given character to the output string, escaping the character if
 // the character would be interpretted as an HTML delimiter.
 NET_EXPORT void AppendEscapedCharForHTML(char c, std::string* output);
 
 // Escapes chars that might cause this text to be interpretted as HTML tags.
 NET_EXPORT std::string EscapeForHTML(const std::string& text);
 NET_EXPORT base::string16 EscapeForHTML(const base::string16& text);
 
+// Escapes characters in text suitable for use as a query part.
+// We %XX everything except alphanumerics, the restricted chracters(;/?:@&=+$,),
+// the mark characters(-_.!~*'()).

[asanka, 2014/10/10 20:59:16]

You are once again going to be bitten by
https://url.spec.whatwg.org/#query-state which follows a slightly different
algorithm that doesn't require escaping '|'.

+NET_EXPORT std::string EscapeQueryPart(const std::string& text);
+
 // Unescaping ------------------------------------------------------------------
 
 class UnescapeRule {
  public:
   // A combination of the following flags that is passed to the unescaping
   // functions.
   typedef uint32 Type;
 
   enum {
     // Don't unescape anything at all.
@@ skipping 59 matching lines @@
     UnescapeRule::Type rules,
     base::OffsetAdjuster::Adjustments* adjustments);
 
 // Unescapes the following ampersand character codes from |text|:
 // < > & " '
 NET_EXPORT base::string16 UnescapeForHTML(const base::string16& text);
 
 }  // namespace net
 
 #endif  // NET_BASE_ESCAPE_H_