Extract guts of ChromeStabilityMetricsProvider into helper class

components/metrics/stability_metrics_helper.h

Index: components/metrics/stability_metrics_helper.h
diff --git a/components/metrics/stability_metrics_helper.h b/components/metrics/stability_metrics_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..868a8420797f7a35d7d0f91404b3b8a91f887b8d
--- /dev/null
+++ b/components/metrics/stability_metrics_helper.h
@@ -0,0 +1,63 @@
+// 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_METRICS_STABILITY_METRICS_HELPER_H_
+#define COMPONENTS_METRICS_STABILITY_METRICS_HELPER_H_
+
+#include "base/basictypes.h"
+#include "base/metrics/user_metrics.h"
+#include "base/process/kill.h"
+
+class PrefRegistrySimple;
+class PrefService;
+
+namespace metrics {
+
+class SystemProfileProto;
+
+// StabilityMetricsHelper is a class that providers functionality common to
+// different embedders' stability metrics providers.
+class StabilityMetricsHelper {
+ public:
+  explicit StabilityMetricsHelper(PrefService* local_state);
+  ~StabilityMetricsHelper();
+
+  // Provides stability metrics.
+  void ProvideStabilityMetrics(SystemProfileProto* system_profile_proto);
+
+  // Clears the gathered stability metrics.
+  void ClearSavedStabilityMetrics();
+
+  // Records a browser child process crash.
+  void BrowserChildProcessCrashed();
+
+  // Logs the initiation of a page load.
+  void LogLoadStarted();
+
+  // Records a renderer process crash.
+  void LogRendererCrash(bool was_exception_process,
+                        base::TerminationStatus status,
+                        int exit_code);
+
+  // Records a renderer process hang.
+  void LogRendererHang();
+
+  // Registers local state prefs used by this class.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
+ private:
+  // Increment an Integer pref value specified by |path|.
+  void IncrementPrefValue(const char* path);
+
+  // Increment a 64-bit Integer pref value specified by |path|.
+  void IncrementLongPrefsValue(const char* path);
+
+  PrefService* local_state_;
+
+  DISALLOW_COPY_AND_ASSIGN(StabilityMetricsHelper);
+};
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_STABILITY_METRICS_HELPER_H_