[Android] Add render test for sync promo in MainSettings

This cl adds a render test to check that sync promo is shown when the
user has signed in with without sync consent.

Bug: 1105800
Change-Id: I24bb2a78f84ebf39586fbe285bc7361ecba30cc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2467878Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817018}

chrome/android/javatests/src/org/chromium/chrome/browser/settings/MainSettingsFragmentTest.java

@@ -417,6 +417,20 @@ public class MainSettingsFragmentTest {
                 mMainSettings.findPreference(MainSettings.PREF_MANAGE_SYNC).isVisible());
     }
 
+    @Test
+    @LargeTest
+    @Feature({"RenderTest"})
+    @Features.EnableFeatures({ChromeFeatureList.MOBILE_IDENTITY_CONSISTENCY})
+    public void testSyncPromoView() throws Exception {
+        mSyncTestRule.setUpAccountAndSignInForTesting();
+        launchSettingsActivity();
+
+        Preference syncPromoPreference = mMainSettings.findPreference(MainSettings.PREF_SYNC_PROMO);
+        CriteriaHelper.pollUiThread(() -> syncPromoPreference.isVisible());
+        View syncPromoView = mMainSettings.getView().findViewById(R.id.signin_promo_view_container);
+        mRenderTestRule.render(syncPromoView, "main_settings_sync_promo");
+    }
+
     @Test
     @SmallTest
     public void testRemoveSettings() {