Detect cygwin as Win32 for the purposes of running GN and downloading from google storage.

This normalizes sys.platform so people running cygwin are treated like Windows.

Review URL: https://codereview.chromium.org/104763003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@238999 0039d316-1c4b-4281-b951-d872f2087c98

download_from_google_storage.py

@@ -32,6 +32,14 @@ class InvalidFileError(IOError):
   pass
 
 
+def GetNormalizedPlatform():
+  """Returns the result of sys.platform accounting for cygwin.
+  Under cygwin, this will always return "win32" like the native Python."""
+  if sys.platform == 'cygwin':
+    return 'win32'
+  return sys.platform
+
+
 # Common utilities
 class Gsutil(object):
   """Call gsutil with some predefined settings.  This is a convenience object,
@@ -197,7 +205,7 @@ def _downloader_worker_thread(thread_num, q, force, base_url,
     # TODO(hinoka): It is supposedly faster to use "gsutil stat" but that
     # doesn't appear to be supported by the gsutil currently in our tree. When
     # we update, this code should use that instead of "gsutil ls -L".
-    if not sys.platform.startswith('win'):
+    if sys.platform != 'win32':
       code, out, _ = gsutil.check_call('ls', '-L', file_url)
       if code != 0:
         out_q.put('%d> %s' % (thread_num, err))

gn.py

@@ -43,7 +43,7 @@ def FindSourceRootOnPath():
 def RunGN(sourceroot):
   # The binaries in platform-specific subdirectories in src/tools/gn/bin.
   gnpath = sourceroot + '/tools/gn/bin/'
-  if sys.platform == 'win32':
+  if sys.platform in ('cygwin', 'win32'):
     gnpath += 'win/gn.exe'
   elif sys.platform.startswith('linux'):
     gnpath += 'linux/gn'