Export stability metrics to UMA from Blimp engine

blimp/engine/common/blimp_browser_context.cc

 // 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.
 
 #include "blimp/engine/common/blimp_browser_context.h"
 
 #include "base/bind.h"
 #include "base/environment.h"
 #include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/nix/xdg_util.h"
 #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"
 #include "components/prefs/pref_service_factory.h"
 #include "content/public/browser/background_sync_controller.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/common/content_switches.h"
 
 namespace {
@@ skipping 69 matching lines @@
   if (!base::PathExists(path_))
     base::CreateDirectory(path_);
   BrowserContext::Initialize(this, path_);
 }
 
 void BlimpBrowserContext::InitPrefService() {
   // Create PrefRegistry and register metrics services preferences with it.
   scoped_refptr<user_prefs::PrefRegistrySyncable> pref_registry(
       new user_prefs::PrefRegistrySyncable());
   metrics::MetricsService::RegisterPrefs(pref_registry.get());
+  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));
 
   // Create a PrefService binding the PrefRegistry to the InMemoryPrefStore.
   // The PrefService ends up owning the PrefRegistry and the InMemoryPrefStore.
   pref_service_ = pref_service_factory.Create(pref_registry.get());
   DCHECK(pref_service_.get());
 }
 
 std::unique_ptr<content::ZoomLevelDelegate>
@@ skipping 84 matching lines @@
 
 net::URLRequestContextGetter*
 BlimpBrowserContext::CreateMediaRequestContextForStoragePartition(
     const base::FilePath& partition_path,
     bool in_memory) {
   return nullptr;
 }
 
 }  // namespace engine
 }  // namespace blimp