Export stability metrics to UMA from Blimp engine

blimp/engine/common/blimp_browser_context.cc

Index: blimp/engine/common/blimp_browser_context.cc
diff --git a/blimp/engine/common/blimp_browser_context.cc b/blimp/engine/common/blimp_browser_context.cc
index 9c86399cb577949889bed1405a2e8c68edd37ecc..a9d74f4232460b80a5664da2d738a7ebe2ed4da6 100644
--- a/blimp/engine/common/blimp_browser_context.cc
+++ b/blimp/engine/common/blimp_browser_context.cc
@@ -12,6 +12,7 @@
 #include "base/path_service.h"
 #include "blimp/engine/app/blimp_permission_manager.h"
 #include "components/metrics/metrics_service.h"
+#include "components/metrics/stability_metrics_helper.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/in_memory_pref_store.h"
 #include "components/prefs/pref_service.h"
@@ -101,8 +102,9 @@ void BlimpBrowserContext::InitPrefService() {
   scoped_refptr<user_prefs::PrefRegistrySyncable> pref_registry(
       new user_prefs::PrefRegistrySyncable());
   metrics::MetricsService::RegisterPrefs(pref_registry.get());
-  PrefServiceFactory pref_service_factory;
+  metrics::StabilityMetricsHelper::RegisterPrefs(pref_registry.get());
 
+  PrefServiceFactory pref_service_factory;
   // Create an in memory preferences store to hold metrics logs.

[Jess, 2016/06/09 18:09:59]

New line before comments that are not at the start of a code block.

[xyzzyz, 2016/06/09 20:01:25]

Done.

   pref_service_factory.set_user_prefs(new InMemoryPrefStore());
   pref_service_factory.set_read_error_callback(base::Bind(&IgnoreReadError));