Use OpenGL sampler objects when available.

Bug: skia:8471
Change-Id: Ida3d08aa72772b8bbd08707048182bee5d27407c
Reviewed-on: https://skia-review.googlesource.com/c/163123
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/gl/GrGLCreateNullInterface.cpp b/src/gpu/gl/GrGLCreateNullInterface.cpp
index a14fc67..ebc11b4 100644
--- a/src/gpu/gl/GrGLCreateNullInterface.cpp
+++ b/src/gpu/gl/GrGLCreateNullInterface.cpp
@@ -419,6 +419,10 @@
         SK_ABORT("Not implemented");
     }
 
+    GrGLvoid genSamplers(GrGLsizei n, GrGLuint* samplers) override {
+        this->genGenericIds(n, samplers);
+    }
+
     GrGLvoid genTextures(GrGLsizei n, GrGLuint *textures) override {
         this->genGenericIds(n, textures);
     }