[Chromecast] Fix for building Android Cast builds with virtualenv.

build/android/gyp/util/build_utils.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.
 
 import ast
 import contextlib
 import fnmatch
 import json
 import os
 import pipes
@@ skipping 388 matching lines @@
 
   return sorted_deps
 
 
 def GetPythonDependencies():
   """Gets the paths of imported non-system python modules.
 
   A path is assumed to be a "system" import if it is outside of chromium's
   src/. The paths will be relative to the current directory.
   """
-  module_paths = (m.__file__ for m in sys.modules.itervalues()
+  # Don't use sys.modules.itervalues() here. Inspecting the modules causes
+  # lazily imported modules (e.g. from email) to get fully imported and update
+  # sys.modules. This causes a runtime error when iterating with itervalues().
+  module_paths = (m.__file__ for m in sys.modules.values()

[agrieve, 2016/12/14 15:35:28]

If it's being updated during iteration, then we're probably missing some modules
now.

Maybe change this to a loop that exits once the list of modules has stabilized?

                   if m is not None and hasattr(m, '__file__'))
 
   abs_module_paths = map(os.path.abspath, module_paths)
 
   assert os.path.isabs(host_paths.DIR_SOURCE_ROOT)
   non_system_module_paths = [
       p for p in abs_module_paths if p.startswith(host_paths.DIR_SOURCE_ROOT)]
   def ConvertPycToPy(s):
     if s.endswith('.pyc'):
       return s[:-1]
@@ skipping 127 matching lines @@
 
   md5_check.CallAndRecordIfStale(
       on_stale_md5,
       record_path=record_path,
       input_paths=input_paths,
       input_strings=input_strings,
       output_paths=output_paths,
       force=force,
       pass_changes=True)