[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..c13e0ec9d9b4989508c06429108f3171b08f0222
--- /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;
+
+// Lookup a domain key in a byte array generated by make_dafsa.py.
+// The rule type is returned if key is found, otherwise kNotFound is returned.
+int LookupString(const unsigned char* graph,
+                 size_t length,
+                 const char* key,
+                 size_t key_length);
+
+}  // namespace net
+
+#endif  // NET_BASE_DAFSA_LOOKUP_STRING_H_