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..ea5e877ca27e8b3bae4565bcd38e111e3f2cc9f3 100644
--- a/include/gpu/gl/angle/SkANGLEGLContext.h
+++ b/include/gpu/gl/angle/SkANGLEGLContext.h
@@ -15,18 +15,25 @@
 class SkANGLEGLContext : public SkGLContext {
 public:
     ~SkANGLEGLContext() override;
-
-    static SkANGLEGLContext* Create(GrGLStandard forcedGpuAPI, bool useGLBackend) {
-        if (kGL_GrGLStandard == forcedGpuAPI) {
+#ifdef SK_BUILD_FOR_WIN
+    static SkANGLEGLContext* CreateDirectX() {
+        SkANGLEGLContext* ctx = new SkANGLEGLContext(false);
+        if (!ctx->isValid()) {
+            delete ctx;
             return NULL;
         }
-        SkANGLEGLContext* ctx = new SkANGLEGLContext(useGLBackend);
+        return ctx;
+    }
+#endif
+    static SkANGLEGLContext* CreateOpenGL() {
+        SkANGLEGLContext* ctx = new SkANGLEGLContext(true);
         if (!ctx->isValid()) {
             delete ctx;
             return NULL;
         }
         return ctx;
     }
+
     GrEGLImage texture2DToEGLImage(GrGLuint texID) const override;
     void destroyEGLImage(GrEGLImage) const override;
     GrGLuint eglImageToExternalTexture(GrEGLImage) const override;