Add flag for zip archiver on files app.

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index c50dc27298c96c8d8066bcc206322cbc0ae9503f..b7e88f56e672eb31496288e0b09c1951979cae38 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2279,6 +2279,12 @@ const char kEnableTouchSupportForScreenMagnifierName[] =
 const char kEnableTouchSupportForScreenMagnifierDescription[] =
     "Enables touch support for screen magnifier";
 
+const char kEnableZipArchiverOnFileManagerName[] =
+    "ZIP archiver for Drive";
+
+const char kEnableZipArchiverOnFileManagerDescription[] =
+    "Enable the ability to archive and unpack files on Drive in the Files app";
+
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_ANDROID)