Differential updates for components.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
===================================================================
--- chrome/common/chrome_switches.cc	(revision 201835)
+++ chrome/common/chrome_switches.cc	(working copy)
@@ -503,6 +503,15 @@
 // supports policy for extensions on Chrome OS.
 const char kEnableComponentCloudPolicy[]    = "enable-component-cloud-policy";
 
+// Enables differential updates for Chrome components, provided that the update
+// server can provide them. Only valid on the browser process.
+const char kEnableComponentUpdateDeltas[]   = "enable-component-update-deltas";
+
+// Enables "pings", requests sent to the update server that report the success
+// or failure of component installation attempts. Only valid on the browser
+// process.
+const char kEnableComponentUpdatePings[]    = "enable-component-update-pings";
+
 // Enables fetching the user's contacts from Google and showing them in the
 // Chrome OS apps list.
 const char kEnableContacts[]                = "enable-contacts";