added support for glMinSampleShading

src/gpu/gl/GrGLTestInterface.cpp

Index: src/gpu/gl/GrGLTestInterface.cpp
diff --git a/src/gpu/gl/GrGLTestInterface.cpp b/src/gpu/gl/GrGLTestInterface.cpp
index 72009813566daf9a9a06573787c6db521c16e6da..c9925874f789afb7287585d969d701596416d302 100644
--- a/src/gpu/gl/GrGLTestInterface.cpp
+++ b/src/gpu/gl/GrGLTestInterface.cpp
@@ -116,6 +116,7 @@ GrGLTestInterface::GrGLTestInterface() {
     fFunctions.fMapBufferRange = bind_to_member(this, &GrGLTestInterface::mapBufferRange);
     fFunctions.fMapBufferSubData = bind_to_member(this, &GrGLTestInterface::mapBufferSubData);
     fFunctions.fMapTexSubImage2D = bind_to_member(this, &GrGLTestInterface::mapTexSubImage2D);
+    fFunctions.fMinSampleShading = bind_to_member(this, &GrGLTestInterface::minSampleShading);
     fFunctions.fPixelStorei = bind_to_member(this, &GrGLTestInterface::pixelStorei);
     fFunctions.fPopGroupMarker = bind_to_member(this, &GrGLTestInterface::popGroupMarker);
     fFunctions.fPushGroupMarker = bind_to_member(this, &GrGLTestInterface::pushGroupMarker);