Add PipelineStatus UMA logging to media_internals

media/base/media_log.h

Index: media/base/media_log.h
diff --git a/media/base/media_log.h b/media/base/media_log.h
index f342ee84fc44185d8590c3ce5c6c2700a7904d45..7a7d541155939f000678d2ad0a2a1b1d530a7ee3 100644
--- a/media/base/media_log.h
+++ b/media/base/media_log.h
@@ -40,8 +40,9 @@ class MEDIA_EXPORT MediaLog : public base::RefCountedThreadSafe<MediaLog> {
  public:
   // Convert various enums to strings.
   static const char* EventTypeToString(MediaLogEvent::Type type);
-  static const char* PipelineStatusToString(PipelineStatus);
-
+  static const char* PipelineStatusToString(PipelineStatus status);
+  static bool StringToPipelineStatus(const std::string status,
+                                     PipelineStatus& out_status);
   MediaLog();
 
   // Add an event to this log. Overriden by inheritors to actually do something