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BeginGpuRaster / EndGpuRaster should be used to scope use of GPU raster via a
GrContext, so that GrContext and RasterImplementationGLES state can be correctly
invalidated.

crrev.com/c/828079 depends on this change.

BUG=757607

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I3c0b8267bc42a051673fc5ef0f91d89dc8f3686e
Reviewed-on: https://chromium-review.googlesource.com/830888
Commit-Queue: Victor Miura <vmiura@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524582}