Add support to GrGLInterface for vertex array objects

src/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp

Index: src/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp
===================================================================
--- src/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp	(revision 7907)
+++ src/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp	(working copy)
@@ -79,11 +79,11 @@
         // mac uses GLenum for internalFormat param (non-standard)
         // amounts to int vs. uint.
         interface->fTexImage2D = (GrGLTexImage2DProc)glTexImage2D;
-    #if GL_ARB_texture_storage
+#if GL_ARB_texture_storage
         interface->fTexStorage2D = glTexStorage2D;
-    #elif GL_EXT_texture_storage
+#elif GL_EXT_texture_storage
         interface->fTexStorage2D = glTexStorage2DEXT;
-    #endif
+#endif
         interface->fTexParameteri = glTexParameteri;
         interface->fTexParameteriv = glTexParameteriv;
         interface->fTexSubImage2D = glTexSubImage2D;
@@ -124,17 +124,22 @@
         interface->fFramebufferRenderbuffer = glFramebufferRenderbuffer;
         interface->fBindRenderbuffer = glBindRenderbuffer;
 
-    #if GL_OES_mapbuffer
+#if GL_OES_mapbuffer
         interface->fMapBuffer = glMapBufferOES;
         interface->fUnmapBuffer = glUnmapBufferOES;
-    #endif
+#endif
 
-    #if GL_APPLE_framebuffer_multisample
+#if GL_APPLE_framebuffer_multisample
         interface->fRenderbufferStorageMultisample = glRenderbufferStorageMultisampleAPPLE;
         interface->fResolveMultisampleFramebuffer = glResolveMultisampleFramebufferAPPLE;
-    #endif
-        interface->fBindFragDataLocationIndexed = NULL;
+#endif
 
+#if GL_OES_vertex_array_object
+        interface->fBindVertexArray = glBindVertexArrayOES;
+        interface->fDeleteVertexArrays = glDeleteVertexArraysOES;
+        interface->fGenVertexArrays = glGenVertexArraysOES;
+#endif
+
         interface->fBindingsExported = kES2_GrGLBinding;
     }
     glInterface.get()->ref();