Chromecast fix: MetricsStateManager segfaults if callbacks are empty.

chromecast/chromecast.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'chromecast_branding%': 'Chromium',
   },
   'target_defaults': {
@@ skipping 27 matching lines @@
           'sources': [
             'common/chromecast_config_simple.cc',
           ],
         }],
       ],
     },
     {
       'target_name': 'cast_metrics',
       'type': '<(component)',
       'dependencies': [
+        'cast_common',
         '../components/components.gyp:component_metrics_proto',
         '../components/components.gyp:metrics',
         '../components/components.gyp:metrics_net',
       ],
       'sources': [
         'metrics/cast_metrics_prefs.cc',
         'metrics/cast_metrics_prefs.h',
         'metrics/cast_metrics_service_client.cc',
         'metrics/cast_metrics_service_client.h',
         'metrics/platform_metrics_providers.h',
       ],
       'conditions': [
         ['chromecast_branding=="Chrome"', {
           'dependencies': [
             '<(cast_internal_gyp):cast_metrics_internal',
           ],
         }, {
           'sources': [
             'metrics/platform_metrics_providers_simple.cc',
           ],
         }],
       ],
     },
     {
+      '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)',
       'dependencies': [
         '../skia/skia.gyp:skia',
       ],
       'sources': [
         'service/cast_service.cc',
         'service/cast_service.h',
       ],
       'conditions': [
@@ skipping 159 matching lines @@
             '<@(_outputs)',
           ],
           'includes': [
             '../build/util/version.gypi',
           ],
         },
       ],
     },
   ],  # end of targets
 }