Keep svn checkout up-to-date in roll scripts.

BUG=chromium:408523
LOG=n
TBR=jarin@chromium.org
TEST=script_test.py

Review URL: https://codereview.chromium.org/551573002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23755 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/push-to-trunk/common_includes.py

@@ -532,6 +532,9 @@ class Step(GitRecipesMixin):
   def SVNCommit(self, root, commit_message):
     patch = self.GitDiff("HEAD^", "HEAD")
     TextToFile(patch, self._config[PATCH_FILE])
+    self.Command("svn", "update", cwd=self._options.svn)
+    if self.Command("svn", "status", cwd=self._options.svn) != "":
+      self.Die("SVN checkout not clean.")
     if not self.Command("patch", "-d %s -p1 -i %s" %
                         (root, self._config[PATCH_FILE]),
                         cwd=self._options.svn):

tools/push-to-trunk/test_scripts.py

@@ -1425,6 +1425,8 @@ git-svn-id: svn://svn.chromium.org/chrome/trunk/src@3456 0039-1c4b
     expectations = self._bumpUpVersion()
     expectations += [
       Cmd("git diff HEAD^ HEAD", "patch content"),
+      Cmd("svn update", "", cwd="[SVN_ROOT]"),
+      Cmd("svn status", "", cwd="[SVN_ROOT]"),
       Cmd("patch -d branches/bleeding_edge -p1 -i %s" %
           TEST_CONFIG[PATCH_FILE], "Applied patch...", cwd="[SVN_ROOT]"),
       Cmd("svn commit --non-interactive --username=author@chromium.org "