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

include/gpu/gl/angle/SkANGLEGLContext.h

Index: include/gpu/gl/angle/SkANGLEGLContext.h
diff --git a/include/gpu/gl/angle/SkANGLEGLContext.h b/include/gpu/gl/angle/SkANGLEGLContext.h
index 7858fff9649de75f4296936760bab8a5a4c47dc0..e9206a07ffdbfaf45891370f60e34d69bcab4820 100644
--- a/include/gpu/gl/angle/SkANGLEGLContext.h
+++ b/include/gpu/gl/angle/SkANGLEGLContext.h
@@ -16,10 +16,7 @@ class SkANGLEGLContext : public SkGLContext {
 public:
     ~SkANGLEGLContext() override;
 
-    static SkANGLEGLContext* Create(GrGLStandard forcedGpuAPI, bool useGLBackend) {
-        if (kGL_GrGLStandard == forcedGpuAPI) {
-            return NULL;
-        }
+    static SkANGLEGLContext* Create(bool useGLBackend) {
         SkANGLEGLContext* ctx = new SkANGLEGLContext(useGLBackend);
         if (!ctx->isValid()) {
             delete ctx;