message: Additional validation in VertexBuffer::Builder::build.
  If a client asks for more than 8 buffers in a VertexBuffer, they will
  either crash (release) or hit an assert in OpenGLDriver (debug). It's
  better to catch this earlier.
  This was noticed while investigating
diff: @@ -124,6 +124,10 @@ VertexBuffer* VertexBuffer::Builder::build(Engine& engine) {
  if (!ASSERT_PRECONDITION_NON_FATAL(mImpl->mBufferCount > 0, "bufferCount cannot be 0")) {
  return nullptr;
  }
  + if (!ASSERT_PRECONDITION_NON_FATAL(mImpl->mBufferCount <= MAX_ATTRIBUTE_BUFFER_COUNT,
  + "bufferCount cannot be more than %d", MAX_ATTRIBUTE_BUFFER_COUNT)) {
  + return nullptr;
  + }
  return upcast(engine).createVertexBuffer(*this);
  }
  