The text color is not right when in dark mode, which makes the text
invisible.
Bug: 168845829
Test: In dark/light mode, scan adb QR code and verify text is visible.
Exempt-From-Owner-Approval: Already approved in ag/12640175
Change-Id: I6d8e16fd2d848d09b49673db041c97d667fea6a9
Bug: 152462657
Test: Manual. Enable TalkBack in Settings > Accessibility. Navigate to
Developer options > Wireless debugging > Pairing device with QR code.
Scan a valid QR code, which should change to "Pairing device..." and
screen reader should say "Pairing device".
Change-Id: If467b56f787bda765fce1e5d46f8ab3c6210dc76
(cherry picked from commit 07ad841e2d)
Exempt-From-Owner-Approval: cherry-pick