add history and visited to assignment status

history is the randomize module's complete history. visited will be True
if the user has actually seen the problem (ie the problem was rendered
via the randomize module's student_view). This is indicated by the
choice being in the history given that the randomize xmodule only stores
history entries from student_view.

lms/djangoapps/courseware/module_tree_reset.py

@@ -233,10 +233,9 @@ class ProctorModuleInfo(object):
             # get title (display_name) of problem assigned, if student had
             # started a problem base this on the "choice" from the randmize
             # module state
-            try:
-                sm.choice = json.loads(sm.state)['choice']
-            except KeyError:
-                sm.choice = None
+            state = json.loads(sm.state)
+            sm.choice = state.get('choice')
+            sm.history = state.get('history')
             if sm.choice is not None:
                 try:
                     sm.problem = self.ms.get_instance(
@@ -279,13 +278,18 @@ class ProctorModuleInfo(object):
             attempted = 'position' in sm.ps_sm.state
             if not attempted and sm.score is not None and sm.score.earned:
                 attempted = True
+            visited = False
+            if sm.choice and sm.history:
+                visited = sm.choice in sm.history
 
             earned = (sm.score.earned if sm.score is not None else None)
             possible = (sm.score.possible if sm.score is not None else None)
             stat = dict(name=name, assignment=sm.rpmod.ra_ps.display_name,
                         pm_sm=sm.ps_sm.state, choice=sm.choice,
+                        history=sm.history,
                         problem=sm.problem_name,
                         attempted=attempted,
+                        visited=visited,
                         earned=earned,
                         possible=possible)
             status['assignments'].append(stat)