Expand net::CookieStore::ChangeCause::EXPLICIT for debugging.

net/cookies/cookie_store.h

Index: net/cookies/cookie_store.h
diff --git a/net/cookies/cookie_store.h b/net/cookies/cookie_store.h
index 32bb1350fdf867c2fefc6b498e7a805e56958cef..63241b5e59a70bd16d2a1d89e713cb0649be2237 100644
--- a/net/cookies/cookie_store.h
+++ b/net/cookies/cookie_store.h
@@ -36,7 +36,14 @@ class NET_EXPORT CookieStore {
     // The cookie was inserted.
     INSERTED,
     // The cookie was changed directly by a consumer's action.
-    EXPLICIT,
+    // The following enum values all have the same meaning, but are being used
+    // to track down where a bug came from.
+    // TODO(nharper): Remove all but one of these and rename to EXPLICIT once
+    // the one of interest has been found.
+    EXPLICIT_DELETE,
+    EXPLICIT_DUPLICATE_IN_BACKING_STORE,
+    EXPLICIT_DONT_RECORD,
+    EXPLICIT_LAST_ENTRY,
     // The cookie was deleted, but no more details are known.
     UNKNOWN_DELETION,
     // The cookie was automatically removed due to an insert operation that