Merge pull request #7657 from huangshiwu/v3_wp8glviewhookpr

V3 wp8glviewhookpr
add NORMAL, BLEND_WEIGHT, BLEND_INDEX flag to be correspondent to GLProgram::VertexAttrib
Merge branch 'v3' into v3_addNewAttribFlag
Merge pull request #7665 from dabingnn/v3_addNewAttribFlag

V3 add new attrib flag