[Chromedriver] Retry deleting temp dir when needed

chrome/test/chromedriver/chrome/scoped_temp_dir_with_retry.cc

Index: chrome/test/chromedriver/chrome/scoped_temp_dir_with_retry.cc
diff --git a/chrome/test/chromedriver/chrome/scoped_temp_dir_with_retry.cc b/chrome/test/chromedriver/chrome/scoped_temp_dir_with_retry.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6d2345d2a99f4ca80d06dc1d73d0b70d061d8ac1
--- /dev/null
+++ b/chrome/test/chromedriver/chrome/scoped_temp_dir_with_retry.cc
@@ -0,0 +1,21 @@
+// Copyright (c) 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/test/chromedriver/chrome/scoped_temp_dir_with_retry.h"
+#include "base/threading/platform_thread.h"
+
+ScopedTempDirWithRetry::~ScopedTempDirWithRetry() {
+  if (IsValid()) {
+    int retry = 0;
+    while (!Delete()) {
+      // Delete failed. Retry up to 100 times, with 10 ms delay between each
+      // retry (thus maximum delay is about 1 second).
+      if (++retry > 100) {
+        DLOG(WARNING) << "Could not delete temp dir in dtor.";

[stgao, 2017/05/03 20:16:50]

nit: It's unclear what dtor means.

+        break;
+      }
+      base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(10));
+    }
+  }
+}