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

net/base/dafsa/lookup_string.h

Index: net/base/dafsa/lookup_string.h
diff --git a/net/base/dafsa/lookup_string.h b/net/base/dafsa/lookup_string.h
new file mode 100644
index 0000000000000000000000000000000000000000..4f85466045dac0f5b1addaf7a606812760298e14
--- /dev/null
+++ b/net/base/dafsa/lookup_string.h
@@ -0,0 +1,26 @@
+// 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>
+
+namespace net {
+
+const int kNotFound = -1;
+const int kExceptionRule = 1;
+const int kWildcardRule = 2;
+const int kPrivateRule = 4;

[tyoshino (SeeGerritForStatus), 2015/10/30 06:29:59]

Now these constants are moved out of the anonymous namespace. They, especially
kNotFound, are given too generic name. Rename?

[Adam Rice, 2015/11/02 13:53:54]

I added "Dafsa" to each of the names. It's a bit ugly but it does work to
disambiguate them.

+
+// Lookup a domain key in a byte array |graph| generated by make_dafsa.py.
+// The rule type is returned if |key| is found, otherwise kNotFound is returned.
+int LookupStringInDafsa(const unsigned char* graph,
+                        size_t length,
+                        const char* key,
+                        size_t key_length);
+
+}  // namespace net
+
+#endif  // NET_BASE_DAFSA_LOOKUP_STRING_H_