Add a function to escape a query part of url

net/base/url_util.h

Index: net/base/url_util.h
diff --git a/net/base/url_util.h b/net/base/url_util.h
index 362be873c11cd4b01936280c7b097e724b432fb5..ed4ee7d7c97b48342699d1edcf00c7ce047a7bb2 100644
--- a/net/base/url_util.h
+++ b/net/base/url_util.h
@@ -77,6 +77,17 @@ NET_EXPORT bool GetValueForKeyInQuery(const GURL& url,
                                       const std::string& search_key,
                                       std::string* out_value);
 
+// Returns a new GURL which is same to |url| except that unsafe characters in a
+// name and a value of each of query parameters are escaped like %XX%XX.

[Ryan Sleevi, 2014/10/09 21:11:04]

Grammatically, this is not valid.

"Returns a new GURL based on |url|, but with unsafe characters in the name and
value of query parameters of |url| escaped"

(e.g. "same to |url|" doesn't read right)

+//
+// Examples:
+//
+// EscapeQueryParameters(GURL("http://example.com/test?q=a|b|c")).spec()
+// => "http://example.com/test?q=a%7Cb%7Cc"
+// EscapeQueryParameters(GURL("http://example.com/test?q=a|b&q2=1|2")).spec()
+// => "http://example.com/test?q=a%7Cb&q2=1%7C2"
+NET_EXPORT GURL EscapeQueryParameters(const GURL& url);
+
 }  // namespace net
 
 #endif  // NET_BASE_URL_UTIL_H_