PlzNavigate: Add first version of NavigationURLLoader.

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index 8b87b7ecae21e3f00fe93fd05add3bce8975a9e2..2d0ee0341a191f3af3d323acf8abd8a42725f09e 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -4,8 +4,14 @@
 
 #include "content/browser/frame_host/navigation_request.h"
 
+#include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigation_request_info.h"
+#include "content/browser/frame_host/navigator.h"
+#include "content/browser/loader/navigation_url_loader.h"
 #include "content/common/resource_request_body.h"
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/stream_handle.h"
+#include "net/url_request/redirect_info.h"
 
 namespace content {
 
@@ -24,7 +30,36 @@ NavigationRequest::~NavigationRequest() {
 void NavigationRequest::BeginNavigation(
     scoped_ptr<NavigationRequestInfo> info,
     scoped_refptr<ResourceRequestBody> request_body) {
-  info_ = info.Pass();
+  DCHECK(!loader_);
+  loader_ = NavigationURLLoader::Create(
+      frame_tree_node_->navigator()->GetController()->GetBrowserContext(),
+      frame_tree_node_->frame_tree_node_id(), common_params_, info.Pass(),
+      request_body.get(), this);
+
+  // TODO(davidben): Fire (and add as necessary) observer methods such as
+  // DidStartProvisionalLoadForFrame for the navigation.
+}
+
+void NavigationRequest::OnRequestRedirected(
+    const net::RedirectInfo& redirect_info,
+    ResourceResponse* response) {
+  // TODO(davidben): Track other changes from redirects. These are important
+  // for, e.g., reloads.
+  common_params_.url = redirect_info.new_url;
+
+  // TODO(davidben): This where prerender and navigation_interceptor should be
+  // integrated. For now, just always follow all redirects.
+  loader_->FollowRedirect();
+}
+
+void NavigationRequest::OnResponseStarted(ResourceResponse* response,
+                                          scoped_ptr<StreamHandle> body) {
+  frame_tree_node_->navigator()->CommitNavigation(frame_tree_node_,
+                                                  response, body.Pass());
+}
+
+void NavigationRequest::OnRequestFailed(int net_error) {
+  // TODO(davidben): Network failures should display a network error page.
   NOTIMPLEMENTED();
 }