AK: Add URL::raw_fragment()

This is a little hackish. Part of the algorithm to get the indicated
part of a DOM::Document
https://html.spec.whatwg.org/multipage/browsing-the-web.html#the-indicated-part-of-the-document
wants to first get the URL's fragment, use it, and then later
percent-decode it and use that. So, we need a way to get that
un-decoded fragment.

AK/URL.cpp

@@ -72,6 +72,11 @@ DeprecatedString URL::fragment() const
     return percent_decode(m_fragment);
 }
 
+DeprecatedString URL::raw_fragment() const
+{
+    return m_fragment;
+}
+
 // NOTE: This only exists for compatibility with the existing URL tests which check for both .is_null() and .is_empty().
 static DeprecatedString deprecated_string_percent_encode(DeprecatedString const& input, URL::PercentEncodeSet set = URL::PercentEncodeSet::Userinfo, URL::SpaceAsPlus space_as_plus = URL::SpaceAsPlus::No)
 {

AK/URL.h

@@ -83,7 +83,9 @@ public:
     ErrorOr<String> serialized_host() const;
     DeprecatedString basename() const;
     DeprecatedString query() const;
+    // NOTE: fragment() is percent-decoded, raw_fragment() is not.
     DeprecatedString fragment() const;
+    DeprecatedString raw_fragment() const;
     Optional<u16> port() const { return m_port; }
     DeprecatedString path_segment_at_index(size_t index) const;
     size_t path_segment_count() const { return m_paths.size(); }