message: Add comparison operator (>=, <=) to FrameBuffer::Dimension
diff: @@ -138,6 +138,14 @@ class FrameBuffer {
  return width != other.width || height != other.height;
  }
  + bool operator>=(const Dimension& other) const {
  + return width >= other.width && height >= other.height;
  + }
  +
  + bool operator<=(const Dimension& other) const {
  + return width <= other.width && height <= other.height;
  + }
  +
  // Swaps width and height.
  void Swap() {
  using std::swap;
  