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diff --git a/components/proximity_auth/logging/logging.h b/components/proximity_auth/logging/logging.h
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+++ b/components/proximity_auth/logging/logging.h
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+// 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_LOGGING_H
+#define COMPONENTS_PROXIMITY_AUTH_LOGGING_LOGGING_H
+
+#include <sstream>
+
+#include "base/logging.h"
+
+namespace proximity_auth {
+
+// Use the PA_LOG() macro for all logging related to Proximity Auth, so the
+// system is aware of all logs related to this feature. We display these logs in
+// the debug WebUI (chrome://proximity-auth).
+//
+// PA_LOG() has the same interface as the standard LOG() macro and also creates
+// a normal log message of the same severity.
+// Examples:
+//   PA_LOG(INFO) << "Waiting for " << x << " pending requests.";
+//   PA_LOG(ERROR) << "Request failed: " << error_string;
+#define PA_LOG(severity)                               \
+  proximity_auth::ScopedLogMessage(__FILE__, __LINE__, \
+                                   logging::LOG_##severity).stream()
+
+// An intermediate object used by the PA_LOG macro, wrapping a
+// logging::LogMessage instance. When this object is destroyed, the message will
+// be logged with the standard logging system and also added to Proximity Auth
+// specific log buffer.  You should use the PA_LOG() macro instead of this class
+// directly.
+class ScopedLogMessage {
+ public:
+  ScopedLogMessage(const char* file, int line, logging::LogSeverity severity);
+  ~ScopedLogMessage();
+
+  std::ostream& stream() { return stream_; }
+
+ private:
+  const char* file_;
+  int line_;
+  logging::LogSeverity severity_;
+  std::ostringstream stream_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedLogMessage);
+};
+
+}  // namespace proximity_auth
+
+#endif  // COMPONENTS_PROXIMITY_AUTH_LOGGING_LOGGING_H