Expose mobile-friendly field for course runs returned by Course API

lms/djangoapps/course_api/serializers.py

@@ -71,6 +71,7 @@ class CourseSerializer(serializers.Serializer):  # pylint: disable=abstract-meth
     start_display = serializers.CharField()
     start_type = serializers.CharField()
     pacing = serializers.CharField()
+    mobile_available = serializers.BooleanField()
 
     # 'course_id' is a deprecated field, please use 'id' instead.
     course_id = serializers.CharField(source='id', read_only=True)

lms/djangoapps/course_api/tests/test_serializers.py

@@ -67,6 +67,7 @@ class TestCourseSerializer(CourseApiFactoryMixin, ModuleStoreTestCase):
             'blocks_url': u'http://testserver/api/courses/v1/blocks/?course_id=edX%2Ftoy%2F2012_Fall',
             'effort': u'6 hours',
             'pacing': 'instructor',
+            'mobile_available': False,
 
             # 'course_id' is a deprecated field, please use 'id' instead.
             'course_id': u'edX/toy/2012_Fall',