Added extensions sync-related constants, switches, and clauses.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 73f5c4c8b912953b13f99730d580a98347e9253b..4187b10fc6abe2bafe40692348498792414ef882 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -204,6 +204,9 @@ const char kDisableSyncAutofill[]           = "disable-sync-autofill";
 // Disable syncing of bookmarks.
 const char kDisableSyncBookmarks[]          = "disable-sync-bookmarks";
 
+// Disable syncing of extensions.
+const char kDisableSyncExtensions[]         = "disable-sync-extensions";
+
 // Disable syncing of passwords.
 const char kDisableSyncPasswords[]          = "disable-sync-passwords";
 
@@ -352,6 +355,9 @@ const char kEnableSyncAutofill[]            = "enable-sync-autofill";
 // Enable syncing browser bookmarks.
 const char kEnableSyncBookmarks[]           = "enable-sync-bookmarks";
 
+// Enable syncing browser extensions.
+const char kEnableSyncExtensions[]          = "enable-sync-extensions";
+
 // Enable syncing browser passwords.
 const char kEnableSyncPasswords[]           = "enable-sync-passwords";