Update idlsync.py to pull in dependencies required for chrome api generation.

third_party/chrome/tools/highlighters/pygments_highlighter.py

-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import sys
-try:
-  import pygments
-  from pygments.lexers import CppLexer
-  from pygments.formatters import HtmlFormatter
-  PYGMENTS_IMPORTED = True
-except ImportError:
-  print('It appears that Pygments is not installed. '
-    'Can be installed using easy_install Pygments or from http://pygments.org.')
-  PYGMENTS_IMPORTED = False
-
-class PygmentsHighlighter(object):
-  def __init__(self):
-    if not PYGMENTS_IMPORTED:
-      raise ImportError('Pygments not installed')
-
-  """Highlighter that uses the python pygments library to highlight code.
-  """
-  def GetCSS(self, style):
-    formatter = HtmlFormatter(linenos=True,
-        style=pygments.styles.get_style_by_name(style))
-    return formatter.get_style_defs('.highlight')
-
-  def GetCodeElement(self, code, style):
-    formatter = HtmlFormatter(linenos=True,
-            style=pygments.styles.get_style_by_name(style))
-    return pygments.highlight(code, CppLexer(), formatter)
-
-  def DisplayName(self):
-    return 'pygments' + ('' if PYGMENTS_IMPORTED else ' (not installed)')
-
-  def GetStyles(self):
-    return list(pygments.styles.get_all_styles())