Add isWritableFileEntry to the fileSystem API

chrome/common/extensions/PRESUBMIT.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 os.path  # for initializing constants
 
 # Directories that we run presubmit checks on.
 PRESUBMIT_PATH = os.path.normpath('chrome/common/extensions/PRESUBMIT.py')
 API_DIR = os.path.normpath('chrome/common/extensions/api')
 DOC_DIR = os.path.normpath('chrome/common/extensions/docs')
@@ skipping 69 matching lines @@
     return [output_api.PresubmitPromptWarning(REBUILD_WARNING + '\n' +
                                               ''.join(warnings) +
                                               REBUILD_INSTRUCTIONS)]
   return []
 
 def IsSkippedFile(path, input_api):
   return input_api.os_path.basename(path) in EXCEPTIONS
 
 def IsApiFile(path, input_api):
   return (input_api.os_path.dirname(path) == API_DIR and
-          path.endswith('.json'))
+          (path.endswith('.json') or path.endswith('.idl')))
 
 def IsBuildFile(path, input_api):
   return input_api.os_path.dirname(path) == BUILD_DIR
 
 def IsTemplateFile(path, input_api):
   return input_api.os_path.dirname(path) == TEMPLATE_DIR
 
 def IsJsFile(path, input_api):
   return (input_api.os_path.dirname(path) == JS_DIR and
           path.endswith('.js'))
@@ skipping 113 matching lines @@
 def SampleZipped(sample_file, input_api):
   """Return True if the zipfile that should contain |sample_file| is in
   this change.
   """
   sample_path = sample_file.LocalPath()
   for af in input_api.AffectedFiles():
     root, ext = input_api.os_path.splitext(af.LocalPath())
     if ext == '.zip' and sample_path.startswith(root):
       return True
   return False