Chromecast fix: MetricsStateManager segfaults if callbacks are empty.

R=lcwu@chromium.org,asvitkine@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/522853002

Cr-Commit-Position: refs/heads/master@{#292691}

chromecast/chromecast.gyp

@@ -45,6 +45,7 @@
       'target_name': 'cast_metrics',
       'type': '<(component)',
       'dependencies': [
+        'cast_common',
         '../components/components.gyp:component_metrics_proto',
         '../components/components.gyp:metrics',
         '../components/components.gyp:metrics_net',
@@ -68,6 +69,21 @@
         }],
       ],
     },
+    {
+      'target_name': 'cast_metrics_unittests',
+      'type': '<(gtest_target_type)',
+      'dependencies': [
+        'cast_metrics',
+        '../base/base.gyp:base_prefs_test_support',
+        '../base/base.gyp:run_all_unittests',
+        '../base/base.gyp:test_support_base',
+        '../components/components.gyp:component_metrics_proto',
+        '../testing/gtest.gyp:gtest',
+      ],
+      'sources': [
+        'metrics/cast_metrics_service_client_unittest.cc',
+      ],
+    },  # end of target 'cast_metrics_unittests'
     {
       'target_name': 'cast_service',
       'type': '<(component)',

chromecast/metrics/cast_metrics_service_client.cc

@@ -7,6 +7,7 @@
 #include "base/i18n/rtl.h"
 #include "chromecast/common/chromecast_config.h"
 #include "chromecast/metrics/platform_metrics_providers.h"
+#include "components/metrics/client_info.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/metrics_service.h"
 #include "components/metrics/metrics_state_manager.h"
@@ -15,6 +16,17 @@
 namespace chromecast {
 namespace metrics {
 
+namespace {
+
+void StoreClientInfo(const ::metrics::ClientInfo& client_info) {
+}
+
+scoped_ptr<::metrics::ClientInfo> LoadClientInfo() {
+  return scoped_ptr<::metrics::ClientInfo>();
+}
+
+}  // namespace
+
 // static
 CastMetricsServiceClient* CastMetricsServiceClient::Create(
     PrefService* pref_service,
@@ -92,12 +104,12 @@ CastMetricsServiceClient::CastMetricsServiceClient(
           pref_service,
           base::Bind(&CastMetricsServiceClient::IsReportingEnabled,
                      base::Unretained(this)),
-                     ::metrics::MetricsStateManager::StoreClientInfoCallback(),
-                     ::metrics::MetricsStateManager::LoadClientInfoCallback())),
+                     base::Bind(&StoreClientInfo),
+                     base::Bind(&LoadClientInfo))),
       metrics_service_(new ::metrics::MetricsService(
           metrics_state_manager_.get(),
           this,
-          ChromecastConfig::GetInstance()->pref_service())),
+          pref_service)),
       request_context_(request_context) {
   // Always create a client id as it may also be used by crash reporting,
   // (indirectly) included in feedback, and can be queried during setup.

chromecast/metrics/cast_metrics_service_client_unittest.cc

+// 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.
+
+#include "chromecast/metrics/cast_metrics_service_client.h"
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/prefs/testing_pref_service.h"
+#include "components/metrics/metrics_service.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromecast {
+
+class CastMetricsTest : public testing::Test {
+ public:
+  CastMetricsTest() {}
+  virtual ~CastMetricsTest() {}
+
+ protected:
+  virtual void SetUp() OVERRIDE {
+    message_loop_.reset(new base::MessageLoop());
+    prefs_.reset(new TestingPrefServiceSimple());
+    ::metrics::MetricsService::RegisterPrefs(prefs_->registry());
+  }
+
+  TestingPrefServiceSimple* prefs() { return prefs_.get(); }
+
+ private:
+  scoped_ptr<base::MessageLoop> message_loop_;
+  scoped_ptr<TestingPrefServiceSimple> prefs_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastMetricsTest);
+};
+
+TEST_F(CastMetricsTest, CreateMetricsServiceClient) {
+  // Create and expect this to not crash.
+  metrics::CastMetricsServiceClient::Create(prefs(), NULL);
+}
+
+}  // namespace chromecast