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/tools/fiddle/egl_context.cpp b/tools/fiddle/egl_context.cpp
index 107bb4f..696a86f 100644
--- a/tools/fiddle/egl_context.cpp
+++ b/tools/fiddle/egl_context.cpp
@@ -77,5 +77,5 @@
     }
     eglTerminate(eglDpy);
 
-    return sk_sp<GrContext>(GrContext::Create(kOpenGL_GrBackend, (GrBackendContext)interface));
+    return sk_sp<GrContext>(GrContext::MakeGL(interface));
 }