[chromedriver] Add page loading strategy to capabilities

chrome/test/chromedriver/chrome/page_loading_strategy.h

Index: chrome/test/chromedriver/chrome/page_loading_strategy.h
diff --git a/chrome/test/chromedriver/chrome/page_loading_strategy.h b/chrome/test/chromedriver/chrome/page_loading_strategy.h
new file mode 100644
index 0000000000000000000000000000000000000000..fdf4203b5b0d470cbf58598205ed0f597a1224fa
--- /dev/null
+++ b/chrome/test/chromedriver/chrome/page_loading_strategy.h
@@ -0,0 +1,30 @@
+// 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_PAGE_LOADING_STRATEGY_H_
+#define CHROME_TEST_CHROMEDRIVER_CHROME_PAGE_LOADING_STRATEGY_H_
+
+#include "chrome/test/chromedriver/chrome/status.h"
+
+class Timeout;
+class Status;
+
+class PageLoadingStrategy {
+public:
+  enum LoadingState {
+    kUnknown,
+    kLoading,
+    kNotLoading,
+  };
+
+  virtual ~PageLoadingStrategy() {}
+
+  virtual Status IsPendingNavigation(const std::string& frame_id,
+                                     const Timeout* timeout,
+                                     bool* is_pending) = 0;
+
+  virtual void set_timed_out(bool timed_out) = 0;
+};
+
+#endif // CHROME_TEST_CHROMEDRIVER_CHROME_PAGE_LOADING_STRATEGY_H_