Export TextClassifier to sc-mainline-prod.

Use Merged-In to skip merging to master. Will resolve the conflict later.

Bug: 187927611
Merged-In: Ic08373aecd85a1c71814e7cc4798b54dc6281bdf
Change-Id: Icb51a375bea23d9767e0241bf50b1178f4382f0f
39 files changed