Add support to GrGLInterface for vertex array objects

src/gpu/gl/GrGLCreateNullInterface.cpp

Index: src/gpu/gl/GrGLCreateNullInterface.cpp
===================================================================
--- src/gpu/gl/GrGLCreateNullInterface.cpp	(revision 7907)
+++ src/gpu/gl/GrGLCreateNullInterface.cpp	(working copy)
@@ -20,6 +20,7 @@
 GrGLvoid GR_GL_FUNCTION_TYPE nullGLBeginQuery(GrGLenum target, GrGLuint id) {}
 GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindAttribLocation(GrGLuint program, GrGLuint index, const char* name) {}
 GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindTexture(GrGLenum target, GrGLuint texture) {}
+GrGLvoid GR_GL_FUNCTION_TYPE nullGLBindVertexArray(GrGLuint id) {}
 GrGLvoid GR_GL_FUNCTION_TYPE nullGLBufferData(GrGLenum target, GrGLsizeiptr size, const GrGLvoid* data, GrGLenum usage) {}
 GrGLvoid GR_GL_FUNCTION_TYPE nullGLPixelStorei(GrGLenum pname, GrGLint param) {}
 GrGLvoid GR_GL_FUNCTION_TYPE nullGLReadPixels(GrGLint x, GrGLint y, GrGLsizei width, GrGLsizei height, GrGLenum format, GrGLenum type, GrGLvoid* pixels) {}
@@ -46,7 +47,6 @@
 GrGLvoid GR_GL_FUNCTION_TYPE nullGLDelete(GrGLuint program) {
 }
 
-
 // In debug builds we do asserts that ensure we agree with GL about when a buffer
 // is mapped.
 static SkTDArray<GrGLuint> gMappedBuffers;
@@ -168,6 +168,7 @@
         interface->fBindBuffer = nullGLBindBuffer;
         interface->fBindFragDataLocation = noOpGLBindFragDataLocation;
         interface->fBindTexture = nullGLBindTexture;
+        interface->fBindVertexArray = nullGLBindVertexArray;
         interface->fBlendColor = noOpGLBlendColor;
         interface->fBlendFunc = noOpGLBlendFunc;
         interface->fBufferData = nullGLBufferData;
@@ -186,6 +187,7 @@
         interface->fDeleteQueries = noOpGLDeleteIds;
         interface->fDeleteShader = nullGLDelete;
         interface->fDeleteTextures = noOpGLDeleteIds;
+        interface->fDeleteVertexArrays = noOpGLDeleteIds;
         interface->fDepthMask = noOpGLDepthMask;
         interface->fDisable = noOpGLDisable;
         interface->fDisableVertexAttribArray = noOpGLDisableVertexAttribArray;
@@ -202,6 +204,7 @@
         interface->fGenBuffers = noOpGLGenIds;
         interface->fGenQueries = noOpGLGenIds;
         interface->fGenTextures = noOpGLGenIds;
+        interface->fGenVertexArrays = noOpGLGenIds;
         interface->fGetBufferParameteriv = nullGLGetBufferParameteriv;
         interface->fGetError = noOpGLGetError;
         interface->fGetIntegerv = noOpGLGetIntegerv;