Add course_start to the fields, and put all fields on the track selection page

common/djangoapps/course_modes/views.py

@@ -23,6 +23,7 @@ from course_modes.models import CourseMode
 from courseware.access import has_access
 from edxmako.shortcuts import render_to_response
 from lms.djangoapps.commerce.utils import EcommerceService
+from lms.djangoapps.experiments.utils import get_experiment_user_metadata_context
 from openedx.core.djangoapps.embargo import api as embargo_api
 from openedx.features.enterprise_support import api as enterprise_api
 from student.models import CourseEnrollment
@@ -151,6 +152,13 @@ class ChooseModeView(View):
             "responsive": True,
             "nav_hidden": True,
         }
+        context.update(
+            get_experiment_user_metadata_context(
+                request,
+                course,
+                request.user,
+            )
+        )
 
         title_content = _("Congratulations!  You are now enrolled in {course_name}").format(
             course_name=course.display_name_with_default_escaped

lms/djangoapps/experiments/utils.py

@@ -45,4 +45,5 @@ def get_experiment_user_metadata_context(request, course, user):
         'pacing_type': 'self_paced' if course.self_paced else 'instructor_paced',
         'upgrade_deadline': upgrade_data and upgrade_data.date,
         'course_key': course.id,
+        'course_start': course.start,
     }

lms/templates/user_metadata.html

@@ -23,7 +23,7 @@ if user:
     user_metadata['username'] = user.username
     user_metadata['user_id'] = user.id
 
-for datekey in ('schedule_start', 'enrollment_time'):
+for datekey in ('schedule_start', 'enrollment_time', 'course_start'):
     user_metadata[datekey] = (
         context.get(datekey).isoformat() if context.get(datekey) else None
     )