Rename GrContext's newDrawContext & drawContext to makeDrawContext

These both return sk_sp.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2186073002

Review-Url: https://codereview.chromium.org/2186073002
diff --git a/tests/ClearTest.cpp b/tests/ClearTest.cpp
index 4afbaba..4dba4bb 100644
--- a/tests/ClearTest.cpp
+++ b/tests/ClearTest.cpp
@@ -45,7 +45,7 @@
     }
     context->freeGpuResources();
 
-    *dc = context->newDrawContext(SkBackingFit::kExact, w, h, kRGBA_8888_GrPixelConfig, nullptr);
+    *dc = context->makeDrawContext(SkBackingFit::kExact, w, h, kRGBA_8888_GrPixelConfig, nullptr);
 
     SkASSERT((*dc)->accessRenderTarget()->getUniqueID() != oldID);