[chromedriver] Add page loading strategy to capabilities

chrome/test/chromedriver/chrome/non_blocking_navigation_tracker.h

Index: chrome/test/chromedriver/chrome/non_blocking_navigation_tracker.h
diff --git a/chrome/test/chromedriver/chrome/non_blocking_navigation_tracker.h b/chrome/test/chromedriver/chrome/non_blocking_navigation_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..87c8c20187e248b6e329f67d939f5e4d9e4ad5d7
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+++ b/chrome/test/chromedriver/chrome/non_blocking_navigation_tracker.h
@@ -0,0 +1,26 @@
+// Copyright (c) 2016 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.
+
+#ifndef CHROME_TEST_CHROMEDRIVER_CHROME_NON_BLOCKING_NAVIGATION_TRACKER_H_
+#define CHROME_TEST_CHROMEDRIVER_CHROME_NON_BLOCKING_NAVIGATION_TRACKER_H_
+
+#include "chrome/test/chromedriver/chrome/page_load_strategy.h"
+
+class Timeout;
+class Status;
+
+class NonBlockingNavigationTracker : public PageLoadStrategy {
+public:
+  NonBlockingNavigationTracker() {}
+
+  ~NonBlockingNavigationTracker() override;
+
+  // Overriden from PageLoadStrategy:
+  Status IsPendingNavigation(const std::string& frame_id,
+                             const Timeout* timeout,
+                             bool* is_pending) override;
+  void set_timed_out(bool timed_out) override;
+};
+
+#endif  // CHROME_TEST_CHROMEDRIVER_CHROME_NON_BLOCKING_NAVIGATION_TRACKER_H_