Improve our event logging greatly

AsyncDisplayKit/Details/ASEventLog.h

@@ -15,15 +15,24 @@
 #endif
 
 #ifndef ASEVENTLOG_ENABLE
-#define ASEVENTLOG_ENABLE 1
+#define ASEVENTLOG_ENABLE DEBUG
 #endif
 
 NS_ASSUME_NONNULL_BEGIN
 
 @interface ASEventLog : NSObject
 
+/**
+ * Create a new event log.
+ *
+ * @param anObject The object whose events we are logging. This object is not retained.
+ */
+- (instancetype)initWithObject:(id)anObject;
+
 - (void)logEventWithBacktrace:(nullable NSArray<NSString *> *)backtrace format:(NSString *)format, ... NS_FORMAT_FUNCTION(2, 3);
 
+- (instancetype)init NS_UNAVAILABLE;
+
 @end
 
 NS_ASSUME_NONNULL_END