[cr tool] Make context implicit

tools/cr/cr/commands/info.py

 # Copyright 2013 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.
 
 """A module for the info implementation of Command."""
 
 import cr
 
 
 class InfoCommand(cr.Command):
   """The cr info command implementation."""
 
   def __init__(self):
     super(InfoCommand, self).__init__()
     self.help = 'Print information about the cr environment'
 
   def AddArguments(self, subparsers):
     parser = super(InfoCommand, self).AddArguments(subparsers)
     parser.add_argument(
         '-s', '--short', dest='_short',
         action='store_true', default=False,
         help='Short form results, useful for scripting.'
     )
     self.ConsumeArgs(parser, 'the environment')
     return parser
 
-  def EarlyArgProcessing(self, context):
-    if getattr(context.args, '_short', False):
+  def EarlyArgProcessing(self):
+    if getattr(cr.context.args, '_short', False):
       self.requires_build_dir = False
 
-  def Run(self, context):
-    if context.remains:
-      for var in context.remains:
-        if getattr(context.args, '_short', False):
-          val = context.Find(var)
+  def Run(self):
+    if cr.context.remains:
+      for var in cr.context.remains:
+        if getattr(cr.context.args, '_short', False):
+          val = cr.context.Find(var)
           if val is None:
             val = ''
           print val
         else:
-          print var, '=', context.Find(var)
+          print var, '=', cr.context.Find(var)
     else:
-      cr.base.client.PrintInfo(context)
+      cr.base.client.PrintInfo()