Add flag to enable syncfs directory support to about:flags.

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 757655e6b5a0194cb8c9a45d13cc3d38d4c0ae46..86feec9f5f913c872a68c65332050589b581591f 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1365,6 +1365,9 @@ const char kSyncTrySsltcpFirstForXmpp[]     = "sync-try-ssltcp-first-for-xmpp";
 // occur.
 const char kSyncEnableDeferredStartup[]     = "sync-enable-deferred-startup";
 
+// Enables directory support for sync filesystem
+const char kSyncEnableDirectoryOperation[] = "enable-sync-directory-operation";

[Gaurav, 2013/05/09 03:17:07]

This flag is duplicated in webkit/fileapi/syncable/syncable_file_system_util.cc

This is a quick fix, Not sure how to share flags between webkit/ and chrome/.
Will look into it later.

+
 // Enables tab dragging to create a real browser.
 const char kTabBrowserDragging[]            = "enable-tab-browser-dragging";