Conditionally insert gl_PointSize into shaders.

src/gpu/vk/GrVkPipelineState.cpp

Index: src/gpu/vk/GrVkPipelineState.cpp
diff --git a/src/gpu/vk/GrVkPipelineState.cpp b/src/gpu/vk/GrVkPipelineState.cpp
index 50250a5ead7933cad5614f1727b778722724ae5d..73ff62ed98be7ef2d0b61f7a812c0fdd6fd6971b 100644
--- a/src/gpu/vk/GrVkPipelineState.cpp
+++ b/src/gpu/vk/GrVkPipelineState.cpp
@@ -487,7 +487,8 @@ bool GrVkPipelineState::Desc::Build(Desc* desc,
                                     const GrPipeline& pipeline,
                                     GrPrimitiveType primitiveType,
                                     const GrGLSLCaps& caps) {
-    if (!INHERITED::Build(desc, primProc, pipeline, caps)) {
+    if (!INHERITED::Build(desc, primProc, primitiveType == kPoints_GrPrimitiveType, pipeline,
+                          caps)) {
         return false;
     }