[NaCl SDK] Convert python scripts from optparse to argparse.

native_client_sdk/src/build_tools/test_sdk.py

Index: native_client_sdk/src/build_tools/test_sdk.py
diff --git a/native_client_sdk/src/build_tools/test_sdk.py b/native_client_sdk/src/build_tools/test_sdk.py
index 0c00a09e91fc47255cf56653bf056ba7e2409151..7f1fe05128c5cbc46ec7afc9038d02c52a22ad34 100755
--- a/native_client_sdk/src/build_tools/test_sdk.py
+++ b/native_client_sdk/src/build_tools/test_sdk.py
@@ -8,7 +8,7 @@
 This script is normally run immediately after build_sdk.py.
 """
 
-import optparse
+import argparse
 import os
 import subprocess
 import sys
@@ -159,15 +159,15 @@ def StepRunBrowserTests(toolchains, experimental):
 
 
 def main(args):
-  usage = '%prog [<options>] [<phase...>]'
-  parser = optparse.OptionParser(description=__doc__, usage=usage)
-  parser.add_option('--experimental', help='build experimental tests',
-                    action='store_true')
-  parser.add_option('--sanitizer',
-                    help='Run sanitizer (asan/tsan/valgrind) tests',
-                    action='store_true')
-  parser.add_option('--verbose', '-v', help='Verbose output',
-                    action='store_true')
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('--experimental', help='build experimental tests',
+                      action='store_true')
+  parser.add_argument('--sanitizer',
+                      help='Run sanitizer (asan/tsan/valgrind) tests',
+                      action='store_true')
+  parser.add_argument('--verbose', '-v', help='Verbose output',
+                      action='store_true')
+  parser.add_argument('phases', nargs="*")
 
   if 'NACL_SDK_ROOT' in os.environ:
     # We don't want the currently configured NACL_SDK_ROOT to have any effect
@@ -183,7 +183,7 @@ def main(args):
   except ImportError:
     pass
 
-  options, args = parser.parse_args(args)
+  options = parser.parse_args(args)
 
   pepper_ver = str(int(build_version.ChromeMajorVersion()))
   pepperdir = os.path.join(OUT_DIR, 'pepper_' + pepper_ver)
@@ -210,9 +210,9 @@ def main(args):
       ('sel_ldr_tests_valgrind', StepRunSelLdrTests, pepperdir, 'valgrind')
     ]
 
-  if args:
+  if options.phases:
     phase_names = [p[0] for p in phases]
-    for arg in args:
+    for arg in options.phases:
       if arg not in phase_names:
         msg = 'Invalid argument: %s\n' % arg
         msg += 'Possible arguments:\n'
@@ -222,7 +222,7 @@ def main(args):
 
   for phase in phases:
     phase_name = phase[0]
-    if args and phase_name not in args:
+    if options.phases and phase_name not in options.phases:
       continue
     phase_func = phase[1]
     phase_args = phase[2:]