[chromedriver] Fix race in navigation tracker.

chrome/test/chromedriver/chrome/navigation_tracker_unittest.cc

Index: chrome/test/chromedriver/chrome/navigation_tracker_unittest.cc
diff --git a/chrome/test/chromedriver/chrome/navigation_tracker_unittest.cc b/chrome/test/chromedriver/chrome/navigation_tracker_unittest.cc
index 8b7f5f234b55ed5f65388fea8fc2d3d897bb460e..55f25e0924c7542ab461b3cd1367aae29b6fc94c 100644
--- a/chrome/test/chromedriver/chrome/navigation_tracker_unittest.cc
+++ b/chrome/test/chromedriver/chrome/navigation_tracker_unittest.cc
@@ -217,3 +217,20 @@ TEST(NavigationTracker, UnknownStateForcesStartReceivesStop) {
   NavigationTracker tracker(&client);
   ASSERT_NO_FATAL_FAILURE(AssertPendingState(&tracker, "f", false));
 }
+
+TEST(NavigationTracker, OnSuccessfulNavigate) {
+  base::DictionaryValue params;
+  DeterminingLoadStateDevToolsClient client(
+      true, "Page.frameStoppedLoading", &params);
+  NavigationTracker tracker(&client, NavigationTracker::kNotLoading);
+  tracker.OnCommandSuccess(&client, "Page.navigate");
+  ASSERT_NO_FATAL_FAILURE(AssertPendingState(&tracker, "f", false));
+}
+
+TEST(NavigationTracker, OnSuccessfulNavigateStillWaiting) {
+  base::DictionaryValue params;
+  DeterminingLoadStateDevToolsClient client(true, std::string(), &params);
+  NavigationTracker tracker(&client, NavigationTracker::kNotLoading);
+  tracker.OnCommandSuccess(&client, "Page.navigate");
+  ASSERT_NO_FATAL_FAILURE(AssertPendingState(&tracker, "f", true));
+}