depot_tools: Add git svn find-rev for safesync_url parsing (commonly LKGR link).

tests/gclient_scm_test.py

Index: tests/gclient_scm_test.py
===================================================================
--- tests/gclient_scm_test.py	(revision 107937)
+++ tests/gclient_scm_test.py	(working copy)
@@ -84,12 +84,22 @@
     self.url = self.SvnUrl()
 
   def testDir(self):
-    members = [
-        'FullUrlForRelativeUrl', 'GetRevisionDate', 'RunCommand',
-        'cleanup', 'diff', 'pack', 'relpath', 'revert',
-        'revinfo', 'runhooks', 'status', 'update',
-        'updatesingle', 'url',
-    ]
+    members = [ 'FindSafesyncRev',
+                'FullUrlForRelativeUrl',
+                'GetRevisionDate',
+                'RunCommand',
+                'cleanup',
+                'diff',
+                'pack',
+                'relpath',
+                'revert',
+                'revinfo',
+                'runhooks',
+                'status',
+                'update',
+                'updatesingle',
+                'url'
+              ]
 
     # If you add a member, be sure to add the relevant test!
     self.compareMembers(self._scm_wrapper('svn://a'), members)
@@ -590,11 +600,21 @@
 
 class ManagedGitWrapperTestCase(BaseGitWrapperTestCase):
   def testDir(self):
-    members = [
-        'FullUrlForRelativeUrl', 'GetRevisionDate', 'RunCommand',
-        'cleanup', 'diff', 'pack', 'relpath', 'revert',
-        'revinfo', 'runhooks', 'status', 'update', 'url',
-    ]
+    members = [ 'FindSafesyncRev',
+                'FullUrlForRelativeUrl',
+                'GetRevisionDate',
+                'RunCommand',
+                'cleanup',
+                'diff',
+                'pack',
+                'relpath',
+                'revert',
+                'revinfo',
+                'runhooks',
+                'status',
+                'update',
+                'url',
+              ]
 
     # If you add a member, be sure to add the relevant test!
     self.compareMembers(gclient_scm.CreateSCM(url=self.url), members)