content::ResourceDispatcherHostImpl changes for stale-while-revalidate

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index f0740b43cfa8ddf2c7e89fb01126068ff8de4f53..f6cd6007ebacd2e92144b52cb52ac2d8c449de7d 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -438,6 +438,11 @@ const char kEnableSmoothScrolling[]         = "enable-smooth-scrolling";
 // Enable spatial navigation
 const char kEnableSpatialNavigation[]       = "enable-spatial-navigation";
 
+// Enables implementation of the Cache-Control: stale-while-revalidate directive
+// which permits servers to allow the use of stale resources while revalidation
+// proceeds in the background.
+const char kEnableStaleWhileRevalidate[]    = "enable-stale-while-revalidate";
+
 // Enables StatsTable, logging statistics to a global named shared memory table.
 const char kEnableStatsTable[]              = "enable-stats-table";