[ChromeDriver] Send DOM.getDocument after each DOM.documentUpdated.

chrome/test/chromedriver/chrome_impl.cc

Index: chrome/test/chromedriver/chrome_impl.cc
diff --git a/chrome/test/chromedriver/chrome_impl.cc b/chrome/test/chromedriver/chrome_impl.cc
index 00871ebcbf870c76370a46ce1f35fae766259a94..e51d40b565eeaa02f62c8f0757d34d097d7092b3 100644
--- a/chrome/test/chromedriver/chrome_impl.cc
+++ b/chrome/test/chromedriver/chrome_impl.cc
@@ -94,7 +94,6 @@ ChromeImpl::ChromeImpl(base::ProcessHandle process,
       context_getter_(context_getter),
       port_(port),
       socket_factory_(socket_factory),
-      dom_tracker_(new DomTracker()),
       frame_tracker_(new FrameTracker()),
       navigation_tracker_(new NavigationTracker()) {
   if (user_data_dir->IsValid()) {
@@ -120,23 +119,20 @@ Status ChromeImpl::Init() {
     return Status(kUnknownError, "unable to discover open pages");
   client_.reset(new DevToolsClientImpl(
       socket_factory_, debugger_urls.front()));
-  client_->AddListener(dom_tracker_.get());
-  client_->AddListener(frame_tracker_.get());
-  client_->AddListener(navigation_tracker_.get());
-
-  // Perform necessary configuration of the DevTools client.
-  // Fetch the root document node so that Inspector will push DOM node
-  // information to the client.
-  base::DictionaryValue params;
-  Status status = client_->SendCommand("DOM.getDocument", params);
+  dom_tracker_.reset(new DomTracker(client_.get()));
+  Status status = dom_tracker_->Init();
   if (status.IsError())
     return status;
-  // Enable page domain notifications to allow tracking navigation state.
-  status = client_->SendCommand("Page.enable", params);
+  status = frame_tracker_->Init(client_.get());
   if (status.IsError())
     return status;
-  // Enable runtime events to allow tracking execution context creation.
-  return client_->SendCommand("Runtime.enable", params);
+  status = navigation_tracker_->Init(client_.get());
+  if (status.IsError())
+    return status;
+  client_->AddListener(dom_tracker_.get());
+  client_->AddListener(frame_tracker_.get());
+  client_->AddListener(navigation_tracker_.get());
+  return Status(kOk);
 }
 
 Status ChromeImpl::Load(const std::string& url) {