Merge "Only report uncached nulls in PIC" into main

    @GuardedBy("mLock")

    private long mMisses = 0;

    // This counter tracks the number of times {@link #recompute} returned a null value.  Null

    // results are cached, or not, depending on instantiation arguments.  Caching nulls when they

    // should not be cached is a functional error. Failing to cache nulls that can be cached is a

    // performance error.  A non-zero value here means the cache should be examined to be sure

    // that nulls are correctly cached, or not.

    // This counter tracks the number of times {@link #recompute} returned a null value and the

    // result was not cached.

    @GuardedBy("mLock")

    private long mNulls = 0;

                if (mLastSeenNonce == currentNonce) {

                    if (result != null || mCacheNullResults) {

                        mCache.put(query, result);

                    }

                    if (result == null) {

                    } else if (result == null) {

                        // The result was null and it was not cached.

                        mNulls++;

                    }

                }