[DO NOT COMMIT] Re-use the dafsa code for s-w-r histograms

net/base/dafsa/lookup_string.h

+// Copyright 2015 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_DAFSA_LOOKUP_STRING_H_
+#define NET_BASE_DAFSA_LOOKUP_STRING_H_
+
+#include <stddef.h>
+
+#include "net/base/net_export.h"
+
+namespace net {
+
+const int kDafsaNotFound = -1;
+const int kDafsaExceptionRule = 1;
+const int kDafsaWildcardRule = 2;
+const int kDafsaPrivateRule = 4;
+
+// Lookup a domain key in a byte array |graph| generated by make_dafsa.py.  The

[eroman, 2015/11/06 23:35:50]

As a standalone function this needs a lot more context in the documentation
explaining what it is.

It may have made sense as part of registry_controlled_domains, but here it needs
more background.

[Adam Rice, 2015/11/09 11:01:21]

I have expanded on the comment to hopefully make it more useful.

+// rule type is returned if |key| is found, otherwise kDafsaNotFound is
+// returned.
+int NET_EXPORT_PRIVATE LookupStringInDafsa(const unsigned char* graph,

[eroman, 2015/11/06 23:35:50]

why NET_EXPORT_PRIVATE and not NET_EXPORT?

[Adam Rice, 2015/11/09 11:01:21]

I was just being conservative. Changed.

+                                           size_t length,
+                                           const char* key,
+                                           size_t key_length);
+
+}  // namespace net
+
+#endif  // NET_BASE_DAFSA_LOOKUP_STRING_H_