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This CL wraps "xyz B" shown on Data saver screen for data statistics
with TtsSpan of type TYPE_MEASURE so that TTS engine announces it as "xyz bytes"

Bug: 461909, 786947
Change-Id: I8924a3cc904e9dc1f0cccc1dc1fa955f9d52a2b2
Reviewed-on: https://chromium-review.googlesource.com/784052
Commit-Queue: Isha Bobra <ibobra@google.com>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521968}