Extension syncing: Introduce a NeedsSync pref

extensions/browser/extension_prefs.cc

Index: extensions/browser/extension_prefs.cc
diff --git a/extensions/browser/extension_prefs.cc b/extensions/browser/extension_prefs.cc
index 79bd5472555310e8566fd98aa23074017c5ee2bd..58ccad71e6c0e4fd030571804bc5a99f79d80d5c 100644
--- a/extensions/browser/extension_prefs.cc
+++ b/extensions/browser/extension_prefs.cc
@@ -192,6 +192,10 @@ const char kPrefDoNotSync[] = "do_not_sync";
 
 const char kCorruptedDisableCount[] = "extensions.corrupted_disable_count";
 
+// A boolean preference that indicates whether the extension has local changes
+// that need to be synced. Default value is false.
+const char kPrefNeedsSync[] = "needs_sync";
+
 // Provider of write access to a dictionary storing extension prefs.
 class ScopedExtensionPrefUpdate : public DictionaryPrefUpdate {
  public:
@@ -1852,6 +1856,16 @@ void ExtensionPrefs::IncrementCorruptedDisableCount() {
   prefs_->SetInteger(kCorruptedDisableCount, count + 1);
 }
 
+bool ExtensionPrefs::NeedsSync(const std::string& extension_id) const {
+  return ReadPrefAsBooleanAndReturn(extension_id, kPrefNeedsSync);
+}
+
+void ExtensionPrefs::SetNeedsSync(const std::string& extension_id,
+                                  bool needs_sync) {
+  UpdateExtensionPref(extension_id, kPrefNeedsSync,
+                      needs_sync ? new base::FundamentalValue(true) : nullptr);
+}
+
 ExtensionPrefs::ExtensionPrefs(
     PrefService* prefs,
     const base::FilePath& root_dir,