Track renderer crash detected on WebState via GlobalWebStateObserver

ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.h

 // 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 IOS_CHROME_BROWSER_METRICS_IOS_CHROME_STABILITY_METRICS_PROVIDER_H_
 #define IOS_CHROME_BROWSER_METRICS_IOS_CHROME_STABILITY_METRICS_PROVIDER_H_
 
 #include "base/macros.h"
 #include "base/metrics/user_metrics.h"
 #include "components/metrics/metrics_provider.h"
@@ skipping 12 matching lines @@
 
   // metrics::MetricsDataProvider:
   void OnRecordingEnabled() override;
   void OnRecordingDisabled() override;
   void ProvideStabilityMetrics(
       metrics::SystemProfileProto* system_profile_proto) override;
   void ClearSavedStabilityMetrics() override;
 
   // web::GlobalWebStateObserver:
   void WebStateDidStartLoading(web::WebState* web_state) override;
+  void RenderProcessGone(web::WebState* web_state) override;
 
   // Records a renderer process crash.
   void LogRendererCrash();
 
  private:
   metrics::StabilityMetricsHelper helper_;
 
   // True if recording is currently enabled.
   bool recording_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeStabilityMetricsProvider);
 };
 
 #endif  // IOS_CHROME_BROWSER_METRICS_IOS_CHROME_STABILITY_METRICS_PROVIDER_H_