Fix GrGLInterface::validate() to check for GL_OES_sample_shading on ES contexts

src/gpu/gl/GrGLInterface.cpp

Index: src/gpu/gl/GrGLInterface.cpp
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 76886015e0fd840ac174f3924befc5865e0b8d8d..01938b1c0f4746be4f3d75bb1fa8343b0cceeff6 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -779,7 +779,7 @@ bool GrGLInterface::validate() const {
         if (nullptr == fFunctions.fMinSampleShading) {
             RETURN_FALSE_INTERFACE
         }
-    } else if (kGL_GrGLStandard == fStandard && fExtensions.has("GL_OES_sample_shading")) {
+    } else if (kGLES_GrGLStandard == fStandard && fExtensions.has("GL_OES_sample_shading")) {
         if (nullptr == fFunctions.fMinSampleShading) {
             RETURN_FALSE_INTERFACE
         }