Do not pass context to minikin in case of Canvas.drawText

Canvas.drawText don't use context info, just draw the given slice of
text.

By this change the performance for the long text gets back.

android.text.CanvasDrawTextTest
  drawText_LongText_SmallWindow : 94,526 us -> 11,268 us

Bug: 111638688
Test: atest CanvasDrawTextTest
Change-Id: I69f8cbf4ff361d213f5d041148dbcc41ebd16c84