message: [TF:XLA] Create DOT file css information with angle brackets.
  The stylesheet string has a length limit while using double quotes. Using angle HTML style delimiters increases or makes limitless the acceptable line length.
diff: @@ -457,7 +457,7 @@ labelloc = t;
  tooltip = " ";
  // DOT graphs accept a stylesheet as a URI. So naturally, an inline
  // stylesheet is a data URI!
  -stylesheet="
  +stylesheet=<
  data:text/css,
  @import url(https://fonts.googleapis.com/css?family=Roboto:400,700);
  svg text {
  @@ -466,7 +466,7 @@ stylesheet="
  }
  %s
  -"
  +>
  )";
  