[Android] Don't show sign out dialog in GoogleServicesSettings

If the user has only signed in without giving sync consent then toggling
"Allow Chrome sign in" off should not show the sign out dialog. Instead
it will sign the user out directly without deleting data saved on device

Bug: 1136075
Change-Id: I7d8a75a9c2474759f67fbb0018fa68ad3fa16163
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460729Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816969}

chrome/android/java/src/org/chromium/chrome/browser/sync/settings/GoogleServicesSettings.java

@@ -40,6 +40,8 @@ import org.chromium.components.browser_ui.settings.SettingsUtils;
 import org.chromium.components.prefs.PrefService;
 import org.chromium.components.signin.GAIAServiceType;
 import org.chromium.components.signin.identitymanager.ConsentLevel;
+import org.chromium.components.signin.identitymanager.IdentityManager;
+import org.chromium.components.signin.metrics.SignoutReason;
 import org.chromium.components.user_prefs.UserPrefs;
 import org.chromium.content_public.browser.UiThreadTaskTraits;
 
@@ -196,23 +198,34 @@ public class GoogleServicesSettings
     public boolean onPreferenceChange(Preference preference, Object newValue) {
         String key = preference.getKey();
         if (PREF_ALLOW_SIGNIN.equals(key)) {
+            IdentityManager identityManager = IdentityServicesProvider.get().getIdentityManager(
+                    Profile.getLastUsedRegularProfile());
             boolean shouldSignUserOut =
-                    IdentityServicesProvider.get()
-                                    .getIdentityManager(Profile.getLastUsedRegularProfile())
-                                    .getPrimaryAccountInfo(ConsentLevel.NOT_REQUIRED)
-                            != null
+                    identityManager.getPrimaryAccountInfo(ConsentLevel.NOT_REQUIRED) != null
                     && !((boolean) newValue);
-            if (shouldSignUserOut) {
+            if (!shouldSignUserOut) {
+                mPrefService.setBoolean(Pref.SIGNIN_ALLOWED, (boolean) newValue);
+                return true;
+            }
+
+            boolean shouldShowSignOutDialog =
+                    identityManager.getPrimaryAccountInfo(ConsentLevel.SYNC) != null;
+            if (!shouldShowSignOutDialog) {
+                // Don't show signout dialog if there's no sync consent, as it never wipes the data.
+                IdentityServicesProvider.get()
+                        .getSigninManager(Profile.getLastUsedRegularProfile())
+                        .signOut(SignoutReason.USER_CLICKED_SIGNOUT_SETTINGS, null, false);
+                mPrefService.setBoolean(Pref.SIGNIN_ALLOWED, false);
+                return true;
+            }
+
             SignOutDialogFragment signOutFragment =
                     SignOutDialogFragment.create(GAIAServiceType.GAIA_SERVICE_TYPE_NONE);
             signOutFragment.setTargetFragment(this, 0);
             signOutFragment.show(getFragmentManager(), SIGN_OUT_DIALOG_TAG);
-                // Don't change the preference state yet, it will be updated by onSignOutClicked if
-                // the user actually confirms the sign-out.
+            // Don't change the preference state yet, it will be updated by onSignOutClicked
+            // if the user actually confirms the sign-out.
             return false;
-            } else {
-                mPrefService.setBoolean(Pref.SIGNIN_ALLOWED, (boolean) newValue);
-            }
         } else if (PREF_SEARCH_SUGGESTIONS.equals(key)) {
             mPrefService.setBoolean(Pref.SEARCH_SUGGEST_ENABLED, (boolean) newValue);
         } else if (PREF_SAFE_BROWSING.equals(key)) {
@@ -365,8 +378,7 @@ public class GoogleServicesSettings
         final DialogFragment clearDataProgressDialog = new ClearDataProgressDialog();
         IdentityServicesProvider.get()
                 .getSigninManager(Profile.getLastUsedRegularProfile())
-                .signOut(org.chromium.components.signin.metrics.SignoutReason
-                                 .USER_CLICKED_SIGNOUT_SETTINGS,
+                .signOut(SignoutReason.USER_CLICKED_SIGNOUT_SETTINGS,
                         new SigninManager.SignOutCallback() {
                             @Override
                             public void preWipeData() {