gclient: Make revinfo work on git.

gclient_scm.py

Index: gclient_scm.py
diff --git a/gclient_scm.py b/gclient_scm.py
index 8cba5409573899b343ca099da468bb9db5798285..b9625f91b90cd23398c7d82d54bcf8c2d1c3f440 100644
--- a/gclient_scm.py
+++ b/gclient_scm.py
@@ -78,7 +78,7 @@ class SCMWrapper(object):
     if file_list is None:
       file_list = []
 
-    commands = ['cleanup', 'export', 'update', 'revert',
+    commands = ['cleanup', 'export', 'update', 'revert', 'revinfo',
                 'status', 'diff', 'pack', 'runhooks']
 
     if not command in commands:
@@ -167,6 +167,10 @@ class GitWrapper(SCMWrapper):
     self._RunGit(['reset', '--hard', merge_base], redirect_stdout=False)
     file_list.extend([os.path.join(self.checkout_path, f) for f in files])
 
+  def revinfo(self, options, args, file_list):
+    """Display revision"""
+    return self._RunGit(['rev-parse', 'HEAD'])
+
   def runhooks(self, options, args, file_list):
     self.status(options, args, file_list)
 
@@ -395,6 +399,10 @@ class SVNWrapper(SCMWrapper):
       # exception.
       logging.error('Failed to update:\n%s' % str(e))
 
+  def revinfo(self, options, args, file_list):
+    """Display revision"""
+    return CaptureSVNHeadRevision(self.url)
+
   def runhooks(self, options, args, file_list):
     self.status(options, args, file_list)