[TTS] Update histograms for recent experiement.
[TTS] Update histograms for recent experiement.

Updates histograms.xml to include histograms from two recent CLs.

BUG=523554, 510504

Review URL: https://codereview.chromium.org/1873703003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#387490}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk