tree d577e13f594a2c0a00913207429799311d4471c7
parent 4cb293392c7b85755a918d94adc342efedae6b3c
author Stephen White <senorblanco@chromium.org> 1579216794 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1579797246 +0000

Implement support for framebufferOnly render targets.

This reflects Dawn and Metal functionality.
Implement a FramebufferOnly flag on GrSurface and GrBackendRenderTarget.
Forward the state from GrBackendRenderTarget to GrSurface.
Check the GrSurface flag in GrGpu::readPixels() and GrGpu::writePixels()
and early-return.

Change-Id: I27d3c9c912b366791bfd0e1db49638d8925742f3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262802
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>