Factor out the string lookup code from registry_controlled_domains

net/base/lookup_string_in_fixed_set.h

Index: net/base/lookup_string_in_fixed_set.h
diff --git a/net/base/socket_performance_watcher.h b/net/base/lookup_string_in_fixed_set.h
similarity index 14%
copy from net/base/socket_performance_watcher.h
copy to net/base/lookup_string_in_fixed_set.h
index e0e76327ce63541e8d0dc2ba23215d34f953df41..793a782ed148d5c3641709cec9bc204c1eee23f6 100644
--- a/net/base/socket_performance_watcher.h
+++ b/net/base/lookup_string_in_fixed_set.h
@@ -2,48 +2,39 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_BASE_SOCKET_PERFORMANCE_WATCHER_H_
-#define NET_BASE_SOCKET_PERFORMANCE_WATCHER_H_
+#ifndef NET_BASE_LOOKUP_STRING_IN_FIXED_SET_H_
+#define NET_BASE_LOOKUP_STRING_IN_FIXED_SET_H_
 
-#include "base/macros.h"
-#include "net/base/net_export.h"
-#include "net/base/socket_performance_watcher_factory.h"
+#include <stddef.h>
 
-namespace base {
-class TimeDelta;
-}  // namespace base
+#include "net/base/net_export.h"
 
 namespace net {
 
-// SocketPerformanceWatcher is the base class for recording and aggregating
-// socket statistics.
-class NET_EXPORT_PRIVATE SocketPerformanceWatcher {
- public:
-  // |socket_performance_watcher_factory| is the factory that constructed
-  // |this| watcher.
-  SocketPerformanceWatcher(
-      const SocketPerformanceWatcherFactory::Protocol protocol,
-      SocketPerformanceWatcherFactory* socket_performance_watcher_factory);
-
-  virtual ~SocketPerformanceWatcher();
-
-  // Called when updated transport layer RTT information is available. This
-  // must be the transport layer RTT from this device to the remote transport
-  // layer endpoint. This method is called immediately after the observation is
-  // made, hence no timestamp.
-  void OnUpdatedRTTAvailable(const base::TimeDelta& rtt) const;
-
- private:
-  // Transport layer protocol used by the socket that |this| is watching.
-  const SocketPerformanceWatcherFactory::Protocol protocol_;
-
-  // |socket_performance_watcher_factory_| is the factory that created
-  // |this| watcher.
-  SocketPerformanceWatcherFactory* socket_performance_watcher_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(SocketPerformanceWatcher);
+enum {
+  kDafsaNotFound = -1,  // key is not in set
+  kDafsaFound = 0,      // key is in set
+  // The following return values are used by the implementation of
+  // GetDomainAndRegistry() and are probably not generally useful.
+  kDafsaExceptionRule = 1,  // key excluded from set via exception
+  kDafsaWildcardRule = 2,   // key matched a wildcard rule
+  kDafsaPrivateRule = 4,    // key matched a private rule
 };
 
+// Looks up the string |key| with length |key_length| in a fixed set of
+// strings. The set of strings must be known at compile time. It is converted to
+// a graph structure named a DAFSA (Deterministic Acyclic Finite State
+// Automaton) by the script make_dafsa.py during compilation. This permits
+// efficient (in time and space) lookup. The graph generated by make_dafsa.py
+// takes the form of a constant byte array which should be supplied via the
+// |graph| and |length| parameters.  The return value is kDafsaNotFound,
+// kDafsaFound, or a bitmap consisting of one or more of kDafsaExceptionRule,
+// kDafsaWildcardRule and kDafsaPrivateRule ORed together.
+NET_EXPORT int LookupStringInFixedSet(const unsigned char* graph,
+                                      size_t length,
+                                      const char* key,
+                                      size_t key_length);
+
 }  // namespace net
 
-#endif  // NET_BASE_SOCKET_PERFORMANCE_WATCHER_H_
+#endif  // NET_BASE_LOOKUP_STRING_IN_FIXED_SET_H_