PlzNavigate: Add first version of NavigationURLLoader.

content/browser/loader/navigation_url_loader_impl.cc

+// Copyright 2014 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 "content/browser/loader/navigation_url_loader_impl.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "content/browser/frame_host/navigation_request_info.h"
+#include "content/browser/loader/navigation_url_loader_core.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/stream_handle.h"
+
+namespace content {
+
+NavigationURLLoaderImpl::NavigationURLLoaderImpl(
+    BrowserContext* browser_context,
+    int64 frame_tree_node_id,
+    const CommonNavigationParams& common_params,
+    scoped_ptr<NavigationRequestInfo> request_info,
+    ResourceRequestBody* request_body,
+    NavigationURLLoader::Delegate* delegate)
+  : delegate_(delegate),

[mmenke, 2014/10/22 15:32:58]

nit:  +2 indent

[davidben, 2014/10/22 20:58:04]

Done.

+    weak_factory_(this) {
+  core_ = new NavigationURLLoaderCore(weak_factory_.GetWeakPtr());
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&NavigationURLLoaderCore::Start, base::Unretained(core_),
+                 browser_context->GetResourceContext(), frame_tree_node_id,
+                 common_params, base::Passed(&request_info),
+                 make_scoped_refptr(request_body)));
+}
+
+NavigationURLLoaderImpl::~NavigationURLLoaderImpl() {
+  BrowserThread::DeleteSoon(BrowserThread::IO, FROM_HERE, core_);
+  core_ = nullptr;
+}
+
+void NavigationURLLoaderImpl::FollowRedirect() {

[mmenke, 2014/10/22 15:32:58]

Suggest adding thread dchecks here and in NavigationURLLoaderCore

[davidben, 2014/10/22 20:58:04]

Done. (I actually ended up removing them now that all the objects live on a
single thread, but they're probably still worthwhile.)

+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&NavigationURLLoaderCore::FollowRedirect,
+                 base::Unretained(core_)));
+}
+
+void NavigationURLLoaderImpl::NotifyRequestRedirected(
+    const net::RedirectInfo& redirect_info,
+    ResourceResponse* response) {
+  delegate_->OnRequestRedirected(redirect_info, response);
+}
+
+void NavigationURLLoaderImpl::NotifyResponseStarted(
+    ResourceResponse* response,
+    scoped_ptr<StreamHandle> body) {
+  delegate_->OnResponseStarted(response, body.Pass());
+}
+
+void NavigationURLLoaderImpl::NotifyRequestFailed(int net_error) {
+  delegate_->OnRequestFailed(net_error);
+}
+
+}  // namespace content