[chromedriver] Fix 3 bugs with frame handling.

chrome/test/chromedriver/chrome/dom_tracker_unittest.cc

Index: chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
diff --git a/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc b/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
index 8a38e7f1301161ae696acfda7c1bb2f7f0b7e334..cd1c41b87163350a42851d0427d817b1d1960bc4 100644
--- a/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
+++ b/chrome/test/chromedriver/chrome/dom_tracker_unittest.cc
@@ -71,3 +71,22 @@ TEST(DomTracker, GetFrameIdForNode) {
   ASSERT_TRUE(tracker.GetFrameIdForNode(102, &frame_id).IsError());
   ASSERT_STREQ("DOM.getDocument", client.PopSentCommand().c_str());
 }
+
+TEST(DomTracker, ChildNodeInserted) {
+  FakeDevToolsClient client;
+  DomTracker tracker(&client);
+  std::string frame_id;
+
+  base::DictionaryValue params;
+  params.Set("node", base::JSONReader::Read("{\"nodeId\":1}"));
+  tracker.OnEvent("DOM.childNodeInserted", params);
+  ASSERT_TRUE(tracker.GetFrameIdForNode(1, &frame_id).IsError());
+  ASSERT_TRUE(frame_id.empty());
+
+  params.Clear();
+  params.Set("node", base::JSONReader::Read(
+      "{\"nodeId\":2,\"frameId\":\"f\"}"));
+  tracker.OnEvent("DOM.childNodeInserted", params);
+  ASSERT_TRUE(tracker.GetFrameIdForNode(2, &frame_id).IsOk());
+  ASSERT_STREQ("f", frame_id.c_str());
+}