CacheStorage: Merge CacheStorage::CacheStorageError and CacheStorageCache::ErrorType

content/common/cache_storage/cache_storage_types.h

Index: content/common/cache_storage/cache_storage_types.h
diff --git a/content/common/cache_storage/cache_storage_types.h b/content/common/cache_storage/cache_storage_types.h
index 26ac5e0fdeb46378a831aabcbb3114c0cd76b835..b52d5176df70a3a13d096b21579380aec7898104 100644
--- a/content/common/cache_storage/cache_storage_types.h
+++ b/content/common/cache_storage/cache_storage_types.h
@@ -47,6 +47,16 @@ struct CONTENT_EXPORT CacheStorageBatchOperation {
   CacheStorageCacheQueryParams match_params;
 };
 
+// This enum is used in histograms, so do not change the ordering and always
+// append new types to the end.
+enum CacheStorageError {
+  CACHE_STORAGE_OK = 0,
+  CACHE_STORAGE_ERROR_EXISTS,
+  CACHE_STORAGE_ERROR_STORAGE,
+  CACHE_STORAGE_ERROR_NOT_FOUND,
+  CACHE_STORAGE_ERROR_LAST = CACHE_STORAGE_ERROR_NOT_FOUND
+};
+
 }  // namespace content
 
 #endif  // CONTENT_COMMON_CACHE_STORAGE_CACHE_STORAGE_TYPES_H_