Reland "implemented metal gpu backend texture upload testing"

This reverts commit a80a012456a95a6996a8901268ec34ed0cc3aecb.

Reason for revert: Fix bot failure.

Original change's description:
> Revert "implemented metal gpu backend texture upload testing"
>
> This reverts commit 36848f6b30ddaca461c98e13b9976b2c449ca547.
>
> Reason for revert: Test-Android-Clang-NVIDIA_Shield-GPU-TegraX1-arm64-Debug-All-Android_CCPR failing.
>
> Original change's description:
> > implemented metal gpu backend texture upload testing
> >
> > Bug: skia:
> > Change-Id: Ia3af58a0710f7f9792b37682a3cc45dd14282b71
> > Reviewed-on: https://skia-review.googlesource.com/140248
> > Commit-Queue: Timothy Liang <[email protected]>
> > Reviewed-by: Greg Daniel <[email protected]>
>
> [email protected],[email protected],[email protected]
>
> Change-Id: Idf40fc78b82aec1efbcc64221b6d2bbf63353960
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: skia:
> Reviewed-on: https://skia-review.googlesource.com/141182
> Reviewed-by: Timothy Liang <[email protected]>
> Commit-Queue: Timothy Liang <[email protected]>

Bug: skia:
Change-Id: Ib8c5b2e0cf9de25c11c14741a32846bcc874d712
Reviewed-on: https://skia-review.googlesource.com/141183
Reviewed-by: Greg Daniel <[email protected]>
Commit-Queue: Timothy Liang <[email protected]>
diff --git a/dm/DMGpuTestProcs.cpp b/dm/DMGpuTestProcs.cpp
index abae628..ae8c7ab 100644
--- a/dm/DMGpuTestProcs.cpp
+++ b/dm/DMGpuTestProcs.cpp
@@ -19,6 +19,9 @@
 bool IsVulkanContextType(sk_gpu_test::GrContextFactory::ContextType type) {
     return kVulkan_GrBackend == GrContextFactory::ContextTypeBackend(type);
 }
+bool IsMetalContextType(sk_gpu_test::GrContextFactory::ContextType type) {
+    return kMetal_GrBackend == GrContextFactory::ContextTypeBackend(type);
+}
 bool IsRenderingGLContextType(sk_gpu_test::GrContextFactory::ContextType type) {
     return IsGLContextType(type) && GrContextFactory::IsRenderingContext(type);
 }