Stop returning run width of StaticLayout.Builder.addStyleRun.

The return value of addStyleRun is not used.
By no longer returning run width, the LineBreaker can defer the
style and line breaking calculation.

Bug: 65024629
Test: bit CtsTextTestCases:*
Change-Id: I2c835ff1c58657863da12976e71007c29b1bb039
3 files changed