Add config options to run different GPU APIs to dm and nanobench

src/gpu/gl/SkNullGLContext.cpp

Index: src/gpu/gl/SkNullGLContext.cpp
diff --git a/src/gpu/gl/SkNullGLContext.cpp b/src/gpu/gl/SkNullGLContext.cpp
index e7270c32c47c6283f5d45e4f2be40bb520a0abda..dafa1ef0bc2c61bce33de698df356690ce66350c 100644
--- a/src/gpu/gl/SkNullGLContext.cpp
+++ b/src/gpu/gl/SkNullGLContext.cpp
@@ -578,10 +578,7 @@ static void set_current_context_from_interface(const GrGLInterface* interface) {
 }
 #endif
 
-SkNullGLContext* SkNullGLContext::Create(GrGLStandard forcedGpuAPI) {
-    if (kGLES_GrGLStandard == forcedGpuAPI) {
-        return nullptr;
-    }
+SkNullGLContext* SkNullGLContext::Create() {
     SkNullGLContext* ctx = new SkNullGLContext;
     if (!ctx->isValid()) {
         delete ctx;