Did you mean to remove the GrContext references completely or just to remove them on the --enable-oop-rasterization path?

The dependency in LTHImpl is to detect if we can safely --enable-gpu-rasterization on the renderer side (both with and without --enable-oop-rasterization).

I think that this is somewhat related to crbug.com/786591. 

I suspect that it's possible to create a GrContext on the renderer side and fail to create one on the GPU process side (and vice versa).

#2: Yes, exactly as you say.

On the GPU process side, we'd eventually like to share the GrContext among different RasterDecoders. Perhaps we can try to create the CrContext early and pass if we are successful up via the gpu::GpuFeatureInfo when you create a GpuChannel on the client side.

I believe that this is very similar to option 2 in https://bugs.chromium.org/p/chromium/issues/detail?id=786591#c1

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/72cf4278866ef427a2cd3c49b7df3844f12faff7

commit 72cf4278866ef427a2cd3c49b7df3844f12faff7
Author: Adrienne Walker <enne@chromium.org>
Date: Mon Apr 02 23:04:35 2018

Fix oop raster disabling itself

After https://chromium-review.googlesource.com/c/chromium/src/+/982098,
enabling oop rasterization by the command line disables gpu rasterization
which in turn disables oop rasterization and uses software rasterization
instead.

This also fixes uses of GrContext that are no longer supported in
GpuImageDecodeCache.

Bug:  826987 ,  793508 
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ifdf1f18eb34e9e63eeb6e39cb66a6ab77e10afcd
Reviewed-on: https://chromium-review.googlesource.com/986744
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547548}
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/cc/paint/oop_pixeltest.cc
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/cc/tiles/gpu_image_decode_cache.cc
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/cc/tiles/gpu_image_decode_cache.h
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/cc/tiles/gpu_image_decode_cache_unittest.cc
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/cc/trees/layer_tree_host_impl.cc
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/cc/trees/layer_tree_host_impl.h
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/components/viz/test/test_web_graphics_context_3d.cc
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/components/viz/test/test_web_graphics_context_3d.h
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/content/renderer/webgraphicscontext3d_provider_impl.cc
[modify] https://crrev.com/72cf4278866ef427a2cd3c49b7df3844f12faff7/gpu/command_buffer/service/gles2_cmd_decoder.cc