Add GrContext.h include to skia renderer for upcoming Skia roll

Due to GrContext refactoring on the Skia-side, this call site of
SkSurface::MakeRenderTarget (on line 2674) will need to know that
GrContext is derived from GrRecordingContext to permit an
upcoming Skia roll.

Here is the responsible Skia-side CL:

https://skia-review.googlesource.com/c/skia/+/299867 (Make SkGpuDevice hold a GrRecordingContext)

Change-Id: Ib425d1572f6dc4c8902ff2eb5a4f55c64e7096a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277964Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Cr-Commit-Position: refs/heads/master@{#784450}

components/viz/service/display/skia_renderer.cc

@@ -57,6 +57,7 @@
 #include "third_party/skia/include/effects/SkRuntimeEffect.h"
 #include "third_party/skia/include/effects/SkShaderMaskFilter.h"
 #include "third_party/skia/include/gpu/GrBackendSurface.h"
+#include "third_party/skia/include/gpu/GrContext.h"
 #include "third_party/skia/include/third_party/skcms/skcms.h"
 #include "ui/gfx/color_transform.h"
 #include "ui/gfx/geometry/axis_transform2d.h"