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Unified Diff: chrome/browser/prefs/pref_hash_tracker.h

Issue 90563003: Fix a race condition in preference metric reporting. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 7 years, 1 month ago
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Index: chrome/browser/prefs/pref_hash_tracker.h
diff --git a/chrome/browser/prefs/pref_hash_tracker.h b/chrome/browser/prefs/pref_hash_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..dde9b9de46d83fa447f067da2b3c027daaca326a
--- /dev/null
+++ b/chrome/browser/prefs/pref_hash_tracker.h
@@ -0,0 +1,25 @@
+// Copyright 2013 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 CHROME_BROWSER_PREFS_PREF_HASH_TRACKER_H_
+#define CHROME_BROWSER_PREFS_PREF_HASH_TRACKER_H_
+
+#include <string>
+
+namespace base {
+class Value;
+} // namespace base
+
+// Updates stored preference value hashes in response to preference value
+// changes.
+class PrefHashTracker {
+ public:
+ virtual ~PrefHashTracker() {}
+
+ // Receives notification of preference value changes.
+ virtual void OnPrefValueChanged(const std::string& path,
+ const base::Value* new_value) = 0;
+};
+
+#endif // CHROME_BROWSER_PREFS_PREF_HASH_TRACKER_H_

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