Add account picker to Support Tab

Add a spinner to select the account for user.

Bug: 32249920
Test: make RunSettingsRoboTests
Change-Id: I372d16ec5ec3230f5f2994d79f4fd27085092236

src/com/android/settings/overlay/SupportFeatureProvider.java

@@ -18,6 +18,7 @@ package com.android.settings.overlay;
 
 import android.accounts.Account;
 import android.annotation.IntDef;
+import android.annotation.NonNull;
 import android.annotation.StringRes;
 import android.app.Activity;
 import android.content.Context;
@@ -111,15 +112,16 @@ public interface SupportFeatureProvider {
     void setShouldShowDisclaimerDialog(Context context, boolean shouldShow);
 
     /**
-     * Returns an {@link Account} that's eligible for support options.
+     * Returns array of {@link Account} that's eligible for support options.
      */
-    Account getSupportEligibleAccount(Context context);
+    @NonNull
+    Account[] getSupportEligibleAccounts(Context context);
 
     /**
      * Starts support activity of specified type
      *
      * @param activity Calling activity
-     * @param account A account returned by {@link #getSupportEligibleAccount}
+     * @param account A account that selected by user
      * @param type The type of support account needs.
      */
     void startSupport(Activity activity, Account account, @SupportType int type);