Track renderer crash detected on WebState via GlobalWebStateObserver

ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.mm

Index: ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.mm
diff --git a/ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.cc b/ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.mm
similarity index 86%
rename from ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.cc
rename to ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.mm
index c7c22b02185ba7cd2a8158ac8fb5c14218a6d10d..e951543988e994c71155f321a76db8d3115e41e7 100644
--- a/ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.cc
+++ b/ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.mm
@@ -4,6 +4,8 @@
 
 #include "ios/chrome/browser/metrics/ios_chrome_stability_metrics_provider.h"
 
+#import "ios/web/public/web_state/web_state.h"
+
 IOSChromeStabilityMetricsProvider::IOSChromeStabilityMetricsProvider(
     PrefService* local_state)
     : helper_(local_state), recording_enabled_(false) {}
@@ -47,3 +49,11 @@ void IOSChromeStabilityMetricsProvider::WebStateDidStartLoading(
 
   helper_.LogLoadStarted();
 }
+
+void IOSChromeStabilityMetricsProvider::RenderProcessGone(
+    web::WebState* web_state) {
+  if (!recording_enabled_)
+    return;
+  LogRendererCrash();
+  // TODO(crbug.com/685649): Logs web_state->GetLastCommittedURL().

[Eugene But (OOO till 7-30), 2017/03/24 15:37:50]

Really nit: s/Logs/Log

[pkl (ping after 24h if needed), 2017/03/27 15:32:47]

Expanded the comment rendering this irrelevant.

+}