[Not Ready To Comimt] Add chrome://flags/#enable-off-main-thread-fetch

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 6b3dd6e223e747cf977ab080adf0c0ad5c2abab2..ff500794a3d820a1467385162af03327643fb2b8 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -99,6 +99,13 @@ const char kSpeculativePrefetchDescription[] =
     R"*("Learning" means that only the database construction is enabled, )*"
     R"*("Prefetching" that learning and prefetching are enabled.)*";
 
+const char kOffMainThreadFetchName[] =
+    "Experimental resource fetch optimizations for workers";
+
+const char kOffMainThreadFetchDescription[] =
+    "If enabled, the resource fetch in worker threads will not be blocked by "
+    "the busy main thread.";
+
 //  Force Tablet Mode
 
 const char kForceTabletModeName[] = "Force Tablet Mode";