The binary glTF format enables us to deliver 3D models on a single file with minimal size.

Binary glTF Specification in: https://github.com/KhronosGroup/glTF/tree/master/extensions/Khronos/KHR_binary_glTF

BUG=644562

Review-Url: https://codereview.chromium.org/2852533004
Cr-Commit-Position: refs/heads/master@{#468198}