Add Make[backend] calls for creating GrContexts

Docs-Preview: https://skia.org/?cl=26369
Bug: skia:
Change-Id: I460ee63e466f85b05918479f068a2e5ca2d70550
Reviewed-on: https://skia-review.googlesource.com/26369
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/tests/ResourceCacheTest.cpp b/tests/ResourceCacheTest.cpp
index b27aaea..48f50a0 100644
--- a/tests/ResourceCacheTest.cpp
+++ b/tests/ResourceCacheTest.cpp
@@ -358,7 +358,7 @@
 class Mock {
 public:
     Mock(int maxCnt, size_t maxBytes) {
-        fContext.reset(GrContext::Create(kMock_GrBackend, (GrBackendContext) nullptr));
+        fContext = GrContext::MakeMock(nullptr);
         SkASSERT(fContext);
         fContext->setResourceCacheLimits(maxCnt, maxBytes);
         GrResourceCache* cache = fContext->getResourceCache();