Fix toolbar text direction for RTL.

- Since the text view extends beyond the text, relying on the default
text direction would place the text to the left side of screen if a
non-localized string is used as the toolbar title.

Before the change: https://screenshot.googleplex.com/fFELQWWuuDX
After the change: https://screenshot.googleplex.com/mHcvMX8v193

Bug: 151359161
Bug: 150957534
Test: Manual

Change-Id: I42fc2720e7027a30a36d8e3db10cabf6bc8fd77f
1 file changed