[NaCl SDK] Update build_sdk.py to display Cr-Commit-Position in README.

native_client_sdk/src/tools/getos.py

Index: native_client_sdk/src/tools/getos.py
diff --git a/native_client_sdk/src/tools/getos.py b/native_client_sdk/src/tools/getos.py
index 62c2b5b7632043f2f4f600404729792acf948036..f14e02e0630494da2158a9bbacab2275fda9a9d1 100755
--- a/native_client_sdk/src/tools/getos.py
+++ b/native_client_sdk/src/tools/getos.py
@@ -68,6 +68,7 @@ def GetSDKVersion():
 
   version = None
   revision = None
+  commit_position = None
   for line in open(readme):
     if ':' in line:
       name, value = line.split(':', 1)
@@ -75,8 +76,10 @@ def GetSDKVersion():
         version = value.strip()
       if name == "Chrome Revision":
         revision = value.strip()
+      if name == "Chrome Commit Position":
+        commit_position = value.strip()
 
-  if revision == None or version == None:
+  if revision is None or version is None or commit_position is None:
     raise Error("error parsing SDK README: %s" % readme)
 
   try:
@@ -84,7 +87,7 @@ def GetSDKVersion():
   except ValueError:
     raise Error("error parsing SDK README: %s" % readme)
 
-  return (version, revision)
+  return (version, revision, commit_position)
 
 
 def GetSystemArch(platform):
@@ -204,6 +207,8 @@ def main(args):
       help='Print major version of the NaCl SDK.')
   parser.add_option('--sdk-revision', action='store_true',
       help='Print revision number of the NaCl SDK.')
+  parser.add_option('--sdk-commit-position', action='store_true',
+      help='Print commit position of the NaCl SDK.')
   parser.add_option('--check-version',
       help='Check that the SDK version is at least as great as the '
            'version passed in.')
@@ -229,6 +234,8 @@ def main(args):
     out = GetSDKVersion()[0]
   elif options.sdk_revision:
     out = GetSDKVersion()[1]
+  elif options.sdk_commit_position:
+    out = GetSDKVersion()[2]
   elif options.check_version:
     required_version = ParseVersion(options.check_version)
     version = GetSDKVersion()