Import new functionality for GL4 backend

src/gpu/gl/GrGLCreateNullInterface.cpp

Index: src/gpu/gl/GrGLCreateNullInterface.cpp
diff --git a/src/gpu/gl/GrGLCreateNullInterface.cpp b/src/gpu/gl/GrGLCreateNullInterface.cpp
index 512c672a65fe1a397280f5b788e09fa44fe73150..41d8f5ddd0097b1f9bca21d4b30e63c59e6b20ff 100644
--- a/src/gpu/gl/GrGLCreateNullInterface.cpp
+++ b/src/gpu/gl/GrGLCreateNullInterface.cpp
@@ -382,9 +382,11 @@ const GrGLInterface* GrGLCreateNullInterface() {
     functions->fDisable = noOpGLDisable;
     functions->fDisableVertexAttribArray = noOpGLDisableVertexAttribArray;
     functions->fDrawArrays = noOpGLDrawArrays;
+    functions->fDrawArraysInstanced = noOpGLDrawArraysInstanced;
     functions->fDrawBuffer = noOpGLDrawBuffer;
     functions->fDrawBuffers = noOpGLDrawBuffers;
     functions->fDrawElements = noOpGLDrawElements;
+    functions->fDrawElementsInstanced = noOpGLDrawElementsInstanced;
     functions->fEnable = noOpGLEnable;
     functions->fEnableVertexAttribArray = noOpGLEnableVertexAttribArray;
     functions->fEndQuery = noOpGLEndQuery;
@@ -464,6 +466,7 @@ const GrGLInterface* GrGLCreateNullInterface() {
     functions->fVertexAttrib3fv = noOpGLVertexAttrib3fv;
     functions->fVertexAttrib4fv = noOpGLVertexAttrib4fv;
     functions->fVertexAttribPointer = noOpGLVertexAttribPointer;
+    functions->fVertexAttribDivisor = noOpGLVertexAttribDivisor;
     functions->fViewport = nullGLViewport;
     functions->fBindFramebuffer = nullGLBindFramebuffer;
     functions->fBindRenderbuffer = nullGLBindRenderbuffer;