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diff --git a/chromium/components/metrics/profiler/tracking_synchronizer_observer.h b/chromium/components/metrics/profiler/tracking_synchronizer_observer.h
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+++ b/chromium/components/metrics/profiler/tracking_synchronizer_observer.h
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+// Copyright (c) 2012 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_METRICS_PROFILER_TRACKING_SYNCHRONIZER_OBSERVER_H_
+#define COMPONENTS_METRICS_PROFILER_TRACKING_SYNCHRONIZER_OBSERVER_H_
+
+#include <vector>
+
+#include "base/macros.h"
+#include "base/process/process_handle.h"
+#include "base/time/time.h"
+#include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
+
+namespace base {
+class TimeDelta;
+}
+
+namespace tracked_objects {
+struct ProcessDataPhaseSnapshot;
+}
+
+namespace metrics {
+
+// Set of profiling events, in no guaranteed order. Implemented as a vector
+// because we don't need to have an efficient .find() on it, so vector<> is more
+// efficient.
+typedef std::vector<ProfilerEventProto::ProfilerEvent> ProfilerEvents;
+
+// Attributes of profiler data passed to
+// TrackingSynchronizerObserver::ReceivedProfilerData.
+struct ProfilerDataAttributes {
+  ProfilerDataAttributes(
+      int profiling_phase,
+      base::ProcessId process_id,
+      ProfilerEventProto::TrackedObject::ProcessType process_type,
+      base::TimeTicks phase_start,
+      base::TimeTicks phase_finish);
+
+  // 0-indexed profiling phase number.
+  const int profiling_phase;
+
+  // ID of the process that reported the data.
+  const base::ProcessId process_id;
+
+  // Type of the process that reported the data.
+  const ProfilerEventProto::TrackedObject::ProcessType process_type;
+
+  // Time of the profiling phase start.
+  const base::TimeTicks phase_start;
+
+  // Time of the profiling phase finish.
+  const base::TimeTicks phase_finish;
+};
+
+// Observer for notifications from the TrackingSynchronizer class.
+class TrackingSynchronizerObserver {
+ public:
+  // Received |process_data_phase| for profiling phase and process defined by
+  // |attributes|.
+  // Each completed phase is associated with an event that triggered the
+  // completion of the phase. |past_events| contains the set of events that
+  // completed prior to the reported phase. This data structure is useful for
+  // quickly computing the full set of profiled traces that occurred before or
+  // after a given event.
+  // The observer should assume there might be more data coming until
+  // FinishedReceivingData() is called.
+  virtual void ReceivedProfilerData(
+      const ProfilerDataAttributes& attributes,
+      const tracked_objects::ProcessDataPhaseSnapshot& process_data_phase,
+      const ProfilerEvents& past_events) = 0;
+
+  // The observer should not expect any more calls to |ReceivedProfilerData()|
+  // (without re-registering).  This is sent either when data from all processes
+  // has been gathered, or when the request times out.
+  virtual void FinishedReceivingProfilerData() {}
+
+ protected:
+  TrackingSynchronizerObserver() {}
+  virtual ~TrackingSynchronizerObserver() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TrackingSynchronizerObserver);
+};
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_PROFILER_TRACKING_SYNCHRONIZER_OBSERVER_H_