Cache per bufferIndex buffer properties in VertexArrayPrivate This is another preparation CL. This CL caches per bindingIndex buffer properties in VertexArrayPrivate: mCachedBufferPropertyMapped and mCachedBufferPropertyMutableOrImpersistent. The only difference between these and mCachedMappedArrayBuffers / mCachedMutableOrImpersistentArrayBuffers is that one indexed by attribIndex and another is indexed by bindingIndex. With this, when attribute binding changes, we no longer need to make buffer access. With this, we can move setVertexAttribBinding and setVertexBindingDivisor from VertexArray into VertexArrayPrivate class and Context argument is also removed. Bug: b/433331119 Change-Id: I666544ee0585727ca92d640f372f5a64d1d85576 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6814156 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Commit-Queue: Charlie Lao <cclao@google.com>