Add a couple of notifications related settings to app/extensions sync:

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
===================================================================
--- chrome/browser/extensions/extension_service.cc	(revision 107300)
+++ chrome/browser/extensions/extension_service.cc	(working copy)
@@ -906,9 +906,12 @@
 
   SyncChange sync_change;
   if (sync_bundle) {
-    ExtensionSyncData extension_sync_data(*extension,
-                                          IsExtensionEnabled(extension_id),
-                                          IsIncognitoEnabled(extension_id));
+    ExtensionSyncData extension_sync_data(
+        *extension,
+        IsExtensionEnabled(extension_id),
+        IsIncognitoEnabled(extension_id),
+        extension_prefs_->IsAppNotificationSetupDone(extension_id),
+        extension_prefs_->IsAppNotificationDisabled(extension_id));
     sync_change = extension_sync_data.GetSyncChange(SyncChange::ACTION_DELETE);
   }
 
@@ -1747,9 +1750,12 @@
 void ExtensionService::SyncExtensionChangeIfNeeded(const Extension& extension) {
   SyncBundle* sync_bundle = GetSyncBundleForExtension(extension);
   if (sync_bundle) {
-    ExtensionSyncData extension_sync_data(extension,
-                                          IsExtensionEnabled(extension.id()),
-                                          IsIncognitoEnabled(extension.id()));
+    ExtensionSyncData extension_sync_data(
+        extension,
+        IsExtensionEnabled(extension.id()),
+        IsIncognitoEnabled(extension.id()),
+        extension_prefs_->IsAppNotificationSetupDone(extension.id()),
+        extension_prefs_->IsAppNotificationDisabled(extension.id()));
 
     SyncChangeList sync_change_list(1, extension_sync_data.GetSyncChange(
         sync_bundle->HasExtensionId(extension.id()) ?
@@ -1909,10 +1915,12 @@
         // version is out of date.  We'll sync back the version we got from
         // sync.
         !bundle.HasPendingExtensionId(extension.id())) {
-      sync_data_list->push_back(
-          ExtensionSyncData(extension,
-                            IsExtensionEnabled(extension.id()),
-                            IsIncognitoEnabled(extension.id())));
+      sync_data_list->push_back(ExtensionSyncData(
+          extension,
+          IsExtensionEnabled(extension.id()),
+          IsIncognitoEnabled(extension.id()),
+          extension_prefs_->IsAppNotificationSetupDone(extension.id()),
+          extension_prefs_->IsAppNotificationDisabled(extension.id())));
     }
   }
 }
@@ -2036,6 +2044,35 @@
     SyncExtensionChangeIfNeeded(*extension);
 }
 
+void ExtensionService::SetAppNotificationSetupDone(
+    const std::string& extension_id,
+    bool value) {
+  const Extension* extension = GetInstalledExtension(extension_id);
+  // This method is called when the user sets up app notifications.
+  // So it is not expected to be called until the extension is installed.
+  if (!extension) {
+    NOTREACHED();
+    return;
+  }
+  extension_prefs_->SetAppNotificationSetupDone(extension_id, value);
+  SyncExtensionChangeIfNeeded(*extension);
+}
+
+void ExtensionService::SetAppNotificationDisabled(
+    const std::string& extension_id,
+    bool value) {
+  const Extension* extension = GetInstalledExtension(extension_id);
+  // This method is called when the user enables/disables app notifications.
+  // So it is not expected to be called until the extension is installed.
+  if (!extension) {
+    NOTREACHED();
+    return;
+  }
+
+  extension_prefs_->SetAppNotificationDisabled(extension_id, value);
+  SyncExtensionChangeIfNeeded(*extension);
+}
+
 bool ExtensionService::CanCrossIncognito(const Extension* extension) {
   // We allow the extension to see events and data from another profile iff it
   // uses "spanning" behavior and it has incognito access. "split" mode