[chromedriver] Add page loading strategy to capabilities

chrome/test/chromedriver/chrome/page_load_strategy.cc

Index: chrome/test/chromedriver/chrome/page_load_strategy.cc
diff --git a/chrome/test/chromedriver/chrome/page_load_strategy.cc b/chrome/test/chromedriver/chrome/page_load_strategy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b6cb7e477ddddcdd8f781b136b73c5d91ba896ca
--- /dev/null
+++ b/chrome/test/chromedriver/chrome/page_load_strategy.cc
@@ -0,0 +1,29 @@
+// 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.
+
+#include "chrome/test/chromedriver/chrome/page_load_strategy.h"
+
+#include "base/logging.h"
+#include "chrome/test/chromedriver/chrome/navigation_tracker.h"
+#include "chrome/test/chromedriver/chrome/non_blocking_navigation_tracker.h"
+
+const char PageLoadStrategy::kNormal[] = "normal";
+const char PageLoadStrategy::kNone[] = "none";
+const char PageLoadStrategy::kEager[] = "eager";
+
+PageLoadStrategy* PageLoadStrategy::Create(
+    std::string strategy,
+    DevToolsClient* client,
+    const BrowserInfo* browser_info,
+    const JavaScriptDialogManager* dialog_manager) {
+  if (strategy == kNone) {
+    return new NonBlockingNavigationTracker();
+  } else if (strategy == kNormal) {
+    return new NavigationTracker(client, browser_info, dialog_manager);
+  } else {
+    NOTREACHED() <<
+        "value of 'strategy' is validated when capability is parsed";

[samuong, 2016/07/29 23:33:45]

just say: "invalid strategy '" << strategy << "'"

[evajiang, 2016/08/01 16:35:46]

Done.

+    return nullptr;
+  }
+}