Added flag for download auto resumptions in native

This CL :
1 - Disables the download auto-resumptions in native feature
2 - Adds a flag for testing purposes

Bug: 948299
Change-Id: I4a04eb17e61e40e9a4d471e1bfaccd77c0029270
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1547763
Reviewed-by: Min Qin <[email protected]>
Commit-Queue: Shakti Sahu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#646590}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 898d349..cd22b23 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -500,6 +500,9 @@
 extern const char kMemlogStackModeNativeWithThreadNames[];
 extern const char kMemlogStackModePseudo[];
 
+extern const char kDownloadAutoResumptionNativeName[];
+extern const char kDownloadAutoResumptionNativeDescription[];
+
 extern const char kEnableNewDownloadBackendName[];
 extern const char kEnableNewDownloadBackendDescription[];