Make checkdeps.py correctly signal failure when using --json.

tools/checkdeps/results.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.
 
 
 """Results object and results formatters for checkdeps tool."""
 
 
 import json
 
@@ skipping 108 matching lines @@
         } for violation in dependee_status.violations]
     })
 
     if self.wrapped_formatter:
       self.wrapped_formatter.AddError(dependee_status)
 
   def GetResults(self):
     with open(self.output_path, 'w') as f:
       f.write(json.dumps(self.results))
 
+    return self.results
 
   def PrintResults(self):
     if self.wrapped_formatter:
       self.wrapped_formatter.PrintResults()
       return
 
     print self.results
 
 
 class TemporaryRulesFormatter(ResultsFormatter):
@@ skipping 29 matching lines @@
     self.count = 0
 
   def AddError(self, dependee_status):
     self.count += len(dependee_status.violations)
 
   def GetResults(self):
     return '%d' % self.count
 
   def PrintResults(self):
     print self.count