public void addFirst(E e) {
        mHead = (mHead - 1) & mCapacityBitmask;
        mElements[mHead] = e;
        if (mHead == mTail) {
            doubleCapacity();
        }
    }
Add an element in front of the CircularArray.

@param e Element to add.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/util/collection/CircularArray.java