Add file listing output to vernier view

[jhawthorn]

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examples/gvl_sleep.rb
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 TOTAL |  SELF  | LINE SOURCE
       |        |    1  # Different (bad) ways to sleep
       |        |    2  
  0.0% |   0.0% |    3  require 'bundler/inline'
       |        |    4  
  1.1% |   0.0% |    5  gemfile do
  0.1% |   0.0% |    6    source 'https://rubygems.org'
       |        |    7  
       |        |    8    gem "gvltest"
       |        |    9  end
       |        |   10  
       |        |   11  def cfunc_sleep_gvl
 24.8% |   0.0% |   12    GVLTest.sleep_holding_gvl(1)
       |        |   13  end
       |        |   14  
       |        |   15  def cfunc_sleep_idle
 24.7% |   0.0% |   16    GVLTest.sleep_without_gvl(1)
       |        |   17  end
       |        |   18  
       |        |   19  def ruby_sleep_gvl
       |        |   20    target = Process.clock_gettime(Process::CLOCK_MONOTONIC, :millisecond) + 1000
  0.2% |   0.0% |   21    while Process.clock_gettime(Process::CLOCK_MONOTONIC, :millisecond) < target
       |        |   22      i = 0
 11.4% |  11.4% |   23      while i < 1000
 13.0% |  13.0% |   24        i += 1
       |        |   25      end
       |        |   26    end
       |        |   27  end
       |        |   28  
       |        |   29  def sleep_idle
 24.7% |   0.0% |   30    sleep 1
       |        |   31  end
       |        |   32  
       |        |   33  def run(name)
       |        |   34    STDOUT.print "#{name}..."
       |        |   35    STDOUT.flush
       |        |   36  
       |        |   37    before = Process.clock_gettime(Process::CLOCK_MONOTONIC)
 98.8% |   0.0% |   38    send(name)
       |        |   39    after = Process.clock_gettime(Process::CLOCK_MONOTONIC)
       |        |   40  
       |        |   41    STDOUT.puts " %.2fs" % (after - before)
       |        |   42  end
       |        |   43  
 24.8% |   0.0% |   44  run(:cfunc_sleep_gvl)
 24.7% |   0.0% |   45  run(:cfunc_sleep_idle)
 24.6% |   0.0% |   46  run(:ruby_sleep_gvl)
 24.7% |   0.0% |   47  run(:sleep_idle)
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