Implement proper svn copy when a file is copied, moved or renamed

[email protected]
BUG=
TEST=A basic unit test verifies history is kept

Review URL: http://codereview.chromium.org/10310034

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@135651 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/checkout.py b/checkout.py
index 6fb32d5..fa732e8 100644
--- a/checkout.py
+++ b/checkout.py
@@ -313,8 +313,12 @@
               if os.path.isfile(filepath):
                 raise PatchApplicationFailed(
                     p.filename, 'File exist but was about to be overwriten')
-              shutil.copy2(
-                  os.path.join(self.project_path, p.source_filename), filepath)
+              self._check_output_svn(
+                  [
+                    'copy',
+                    os.path.join(self.project_path, p.source_filename),
+                    filepath
+                  ])
             if p.diff_hunks:
               cmd = ['patch', '-p%s' % p.patchlevel, '--forward', '--force']
               stdout += subprocess2.check_output(
@@ -323,7 +327,9 @@
               # There is only a header. Just create the file if it doesn't
               # exist.
               open(filepath, 'w').close()
-          if p.is_new:
+          if p.is_new and not p.source_filename:
+            # Do not run it if p.source_filename is defined, since svn copy was
+            # using above.
             stdout += self._check_output_svn(
                 ['add', p.filename, '--force'], credentials=False)
           for prop in p.svn_properties: