Fix user photo popup layout for RTL

When RTL language is set, the edit-photo popup window
on user profile info is not shown fully.
The popup window should be aligned with the anchor.
Cherrypick of https://android-review.googlesource.com/#/c/207762/

Bug: 27955356
Change-Id: Ia928c99fbfff3596b048cc3949aef6d03594fed7

src/com/android/settings/users/EditUserPhotoController.java

@@ -37,6 +37,7 @@ import android.provider.ContactsContract.DisplayPhoto;
 import android.provider.MediaStore;
 import android.support.v4.content.FileProvider;
 import android.util.Log;
+import android.view.Gravity;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.AdapterView;
@@ -166,6 +167,7 @@ public class EditUserPhotoController {
         final int width = Math.max(mImageView.getWidth(), context.getResources()
                 .getDimensionPixelSize(R.dimen.update_user_photo_popup_min_width));
         listPopupWindow.setWidth(width);
+        listPopupWindow.setDropDownGravity(Gravity.START);
 
         listPopupWindow.setOnItemClickListener(new AdapterView.OnItemClickListener() {
             @Override