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diff --git a/chromium/components/metrics/metrics_provider.h b/chromium/components/metrics/metrics_provider.h
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+// 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.
+
+#ifndef COMPONENTS_METRICS_METRICS_PROVIDER_H_
+#define COMPONENTS_METRICS_METRICS_PROVIDER_H_
+
+#include "base/macros.h"
+
+namespace base {
+class HistogramSnapshotManager;
+}  // namespace base
+
+namespace metrics {
+
+class ChromeUserMetricsExtension;
+class SystemProfileProto;
+class SystemProfileProto_Stability;
+
+// MetricsProvider is an interface allowing different parts of the UMA protos to
+// be filled out by different classes.
+class MetricsProvider {
+ public:
+  MetricsProvider();
+  virtual ~MetricsProvider();
+
+  // Called after initialiazation of MetricsService and field trials.
+  virtual void Init();
+
+  // Called when a new MetricsLog is created.
+  virtual void OnDidCreateMetricsLog();
+
+  // Called when metrics recording has been enabled.
+  virtual void OnRecordingEnabled();
+
+  // Called when metrics recording has been disabled.
+  virtual void OnRecordingDisabled();
+
+  // Provides additional metrics into the system profile.
+  virtual void ProvideSystemProfileMetrics(
+      SystemProfileProto* system_profile_proto);
+
+  // Called once at startup to see whether this provider has critical stability
+  // events to share in an initial stability log.
+  // Returning true can trigger ProvideInitialStabilityMetrics and
+  // ProvideStabilityMetrics on all other registered metrics providers.
+  // Default implementation always returns false.
+  virtual bool HasInitialStabilityMetrics();
+
+  // Called at most once at startup when an initial stability log is created.
+  // It provides critical statiblity metrics that need to be reported in an
+  // initial stability log.
+  // Default implementation is a no-op.
+  virtual void ProvideInitialStabilityMetrics(
+      SystemProfileProto* system_profile_proto);
+
+  // Provides additional stability metrics. Stability metrics can be provided
+  // directly into |stability_proto| fields or by logging stability histograms
+  // via the UMA_STABILITY_HISTOGRAM_ENUMERATION() macro.
+  virtual void ProvideStabilityMetrics(
+      SystemProfileProto* system_profile_proto);
+
+  // Called to indicate that saved stability prefs should be cleared, e.g.
+  // because they are from an old version and should not be kept.
+  virtual void ClearSavedStabilityMetrics();
+
+  // Provides general metrics that are neither system profile nor stability
+  // metrics. May also be used to add histograms when final metrics are
+  // collected right before upload.
+  virtual void ProvideGeneralMetrics(
+      ChromeUserMetricsExtension* uma_proto);
+
+  // Called during collection to explicitly load histogram snapshots using a
+  // snapshot manager. PrepareDeltas() will have already been called and
+  // FinishDeltas() will be called later; calls to only PrepareDelta(), not
+  // PrepareDeltas (plural), should be made.
+  virtual void RecordHistogramSnapshots(
+      base::HistogramSnapshotManager* snapshot_manager);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MetricsProvider);
+};
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_METRICS_PROVIDER_H_