Added constants, strings, protos for app sync.

chrome/common/chrome_switches.h

Index: chrome/common/chrome_switches.h
diff --git a/chrome/common/chrome_switches.h b/chrome/common/chrome_switches.h
index 7e486b29e2970a5aaa45be7103aac4dceb6c76b6..9251a252d22d12bf70cc078d263bd1c525c6202f 100644
--- a/chrome/common/chrome_switches.h
+++ b/chrome/common/chrome_switches.h
@@ -74,6 +74,7 @@ extern const char kDisableSessionStorage[];
 extern const char kDisableSharedWorkers[];
 extern const char kDisableSiteSpecificQuirks[];
 extern const char kDisableSync[];
+extern const char kDisableSyncApps[];
 extern const char kDisableSyncAutofill[];
 extern const char kDisableSyncBookmarks[];
 extern const char kDisableSyncExtensions[];
@@ -127,6 +128,7 @@ extern const char kEnableSearchProviderApiV2[];
 extern const char kEnableSpeechInput[];
 extern const char kEnableStatsTable[];
 extern const char kEnableSync[];
+extern const char kEnableSyncApps[];
 extern const char kEnableSyncAutofill[];
 extern const char kEnableSyncBookmarks[];
 extern const char kEnableSyncExtensions[];