public BigPictureStyle setBigContentTitle(CharSequence title) {
            mBigContentTitle = Builder.limitCharSequenceLength(title);
            return this;
        }
Overrides ContentTitle in the big form of the template.
This defaults to the value passed to setContentTitle().
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java