Fix dirty rect used when updating GrRenderTarget after clearing as draw in GrGLGpu.

Change-Id: Ifa5ea8b459fa316db4d626f9a25d992535b49d36
Reviewed-on: https://skia-review.googlesource.com/61760
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed