Add an atom to log TextClassifier API latency and result Bug: 169042373 Test: m TextClassifierService Merged-In: If37cfefbc0e0714acc698ecb3bbd54a51b052e28 Change-Id: If37cfefbc0e0714acc698ecb3bbd54a51b052e28 (cherry picked from commit 5359aa7a86fd98b68500954b350d00d1dda301fe)