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

chrome/browser/safe_browsing/tracked_preference_incident_handlers.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/tracked_preference_incident_handlers.h"
+
+#include "base/logging.h"
+#include "chrome/browser/safe_browsing/incident_handler_util.h"
+#include "chrome/common/safe_browsing/csd.pb.h"
+
+namespace safe_browsing {
+
+std::string GetTrackedPreferenceIncidentKey(
+    const ClientIncidentReport_IncidentData& incident_data) {
+  DCHECK(incident_data.has_tracked_preference());
+  DCHECK(incident_data.tracked_preference().has_path());
+  return incident_data.tracked_preference().path();
+}
+
+uint32_t GetTrackedPreferenceIncidentDigest(
+    const ClientIncidentReport_IncidentData& incident_data) {
+  DCHECK(incident_data.has_tracked_preference());
+
+  // Tracked preference incidents are sufficiently canonical (and have no
+  // default values), so it's safe to serialize the incident as given.
+  return HashMessage(incident_data.tracked_preference());
+}
+
+}  // namespace safe_browsing