Make bmp text position attribute be highp

Bug: chromium:746290
Change-Id: I90968ab3633fb50a13087500a7df7fb8adbf2af8
Reviewed-on: https://skia-review.googlesource.com/31423
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed