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diff --git a/components/proximity_auth/logging/log_buffer.h b/components/proximity_auth/logging/log_buffer.h
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+++ b/components/proximity_auth/logging/log_buffer.h
@@ -0,0 +1,64 @@
+// 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 COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H
+#define COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H
+
+#include <list>
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/time/time.h"
+
+namespace proximity_auth {
+
+// Contains logs specific to the Proximity Auth. This buffer has a maximum size
+// and will discard entries in FIFO order.
+// Call LogBuffer::GetInstance() to get the global LogBuffer instance.
+class LogBuffer {
+ public:
+  // Represents a single log entry in the log buffer.
+  struct LogMessage {
+    const std::string text;
+    const base::Time time;
+    const std::string file;
+    const int line;
+    const logging::LogSeverity severity;
+
+    LogMessage(const std::string& text,
+               const base::Time& time,
+               const std::string& file,
+               int line,
+               logging::LogSeverity severity);
+  };
+
+  LogBuffer();
+  ~LogBuffer();
+
+  // Returns the global instance.
+  static LogBuffer* GetInstance();
+
+  // Adds a new log message to the buffer. If the number of log messages exceeds
+  // the maximum, then the earliest added log will be removed.
+  void AddLogMessage(const LogMessage& log_message);
+
+  // Clears all logs in the buffer.
+  void Clear();
+
+  // Returns the maximum number of logs that can be stored.
+  size_t MaxBufferSize() const;
+
+  // Returns the list logs in the buffer, sorted chronologically.
+  const std::list<LogMessage>* logs() { return &log_messages_; }
+
+ private:
+  // The messages currently in the buffer.
+  std::list<LogMessage> log_messages_;
+
+  DISALLOW_COPY_AND_ASSIGN(LogBuffer);
+};
+
+}  // namespace proximity_auth
+
+#endif  // COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H