More fine-grained pruning in safe browsing incident reporting service.

chrome/browser/safe_browsing/incident_handler_util.cc

+// Copyright 2014 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.
+
+#include "chrome/browser/safe_browsing/incident_handler_util.h"
+
+#include <string>
+
+#include "base/hash.h"
+#include "base/logging.h"
+#include "third_party/protobuf/src/google/protobuf/message_lite.h"
+
+namespace safe_browsing {
+
+// Computes a simple hash digest over the serialized form of |message|.
+// |message| must be in a canonical form.
+uint32_t HashMessage(const google::protobuf::MessageLite& message) {
+  std::string message_string;
+  if (!message.SerializeToString(&message_string)) {
+    NOTREACHED();
+    return 0;
+  }
+  return base::Hash(message_string);
+}
+
+}  // namespace safe_browsing