Image labels pref syncs across a user's accounts.

Bug: 905419
Change-Id: Id5e803304da0e864113186bd7c0c9b2d1b88777b
Reviewed-on: https://chromium-review.googlesource.com/c/1496485Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636868}

chrome/browser/accessibility/accessibility_labels_service.cc

@@ -24,9 +24,12 @@ AccessibilityLabelsService::~AccessibilityLabelsService() {}
 // static
 void AccessibilityLabelsService::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterBooleanPref(prefs::kAccessibilityImageLabelsEnabled, false);
-  registry->RegisterBooleanPref(prefs::kAccessibilityImageLabelsOptInAccepted,
-                                false);
+  registry->RegisterBooleanPref(
+      prefs::kAccessibilityImageLabelsEnabled, false,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterBooleanPref(
+      prefs::kAccessibilityImageLabelsOptInAccepted, false,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
 void AccessibilityLabelsService::Init() {