Chromecast: adds handler to log metrics from external processes.

chromecast/browser/metrics/cast_stability_metrics_provider.h

 // 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 CHROMECAST_BROWSER_METRICS_CAST_STABILITY_METRICS_PROVIDER_H_
 #define CHROMECAST_BROWSER_METRICS_CAST_STABILITY_METRICS_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/metrics/user_metrics.h"
 #include "base/process/kill.h"
 #include "components/metrics/metrics_provider.h"
 #include "content/public/browser/browser_child_process_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-class MetricsService;
 class PrefRegistrySimple;
 
 namespace content {
 class RenderProcessHost;
 class WebContents;
 }
 
+namespace metrics {
+class MetricsService;
+}
+
 namespace chromecast {
 namespace metrics {
 
 // CastStabilityMetricsProvider gathers and logs stability-related metrics.
 // Loosely based on ChromeStabilityMetricsProvider from chrome/browser/metrics.
 class CastStabilityMetricsProvider
     : public ::metrics::MetricsProvider,
       public content::BrowserChildProcessObserver,
       public content::NotificationObserver {
  public:
   // Registers local state prefs used by this class.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
-  CastStabilityMetricsProvider();
+  explicit CastStabilityMetricsProvider(
+      ::metrics::MetricsService* metrics_service);
   virtual ~CastStabilityMetricsProvider();
 
   // metrics::MetricsDataProvider implementation:
   virtual void OnRecordingEnabled() override;
   virtual void OnRecordingDisabled() override;
   virtual void ProvideStabilityMetrics(
       ::metrics::SystemProfileProto* system_profile_proto) override;
 
+  // Logs an external crash, presumably from the ExternalMetrics service.
+  void LogExternalCrash(const std::string& crash_type);
+
  private:
   // content::NotificationObserver implementation:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) override;
 
   // content::BrowserChildProcessObserver implementation:
   virtual void BrowserChildProcessCrashed(
       const content::ChildProcessData& data) override;
 
   // Records a renderer process crash.
   void LogRendererCrash(content::RenderProcessHost* host,
                         base::TerminationStatus status,
                         int exit_code);
 
   // Records a renderer process hang.
   void LogRendererHang();
 
   // Registrar for receiving stability-related notifications.
   content::NotificationRegistrar registrar_;
 
+  // Reference to the current MetricsService. Raw pointer is safe, since
+  // MetricsService is responsible for the lifetime of
+  // CastStabilityMetricsProvider.
+  ::metrics::MetricsService* metrics_service_;
+
   DISALLOW_COPY_AND_ASSIGN(CastStabilityMetricsProvider);
 };
 
 }  // namespace metrics
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_METRICS_CAST_STABILITY_METRICS_PROVIDER_H_