Merge "clean up render_pdfs:      Remove unused headers      replace dynamic memory wstream with null wstream.      Use SkAutoTDelete when appropriate.      Replace PdfRenderer class with short function: pdf_to_stream.      Collapse render_pdf, process_input, tool_main_core functions      Split out process_input_files function.      Don't crash when no arguments given.      print out max rss on each skp.      prettier output" into master-skia

https://skia.googlesource.com/skia/+/8b2cb33

Change-Id: I68e9444bf5bb3133876b933d4a8230c30c3c4d7d