PlzNavigate: Speculatively spawns a renderer process for navigations.

content/browser/frame_host/navigator_impl.cc

 // Copyright 2013 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/frame_host/navigator_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 760 matching lines @@
   scoped_ptr<NavigationRequestInfo> info(new NavigationRequestInfo(params));
 
   info->first_party_for_cookies =
       frame_tree_node->IsMainFrame()
           ? navigation_request->common_params().url
           : frame_tree_node->frame_tree()->root()->current_url();
   info->is_main_frame = frame_tree_node->IsMainFrame();
   info->parent_is_main_frame = !frame_tree_node->parent() ?
       false : frame_tree_node->parent()->IsMainFrame();
 
-  // TODO(clamy): Inform the RenderFrameHostManager that a navigation is about
-  // to begin, so that it can speculatively spawn a new renderer if needed.
+  // First start the request on the IO thread.
+  navigation_request->BeginNavigation(info.Pass(), params.request_body);
 
-  navigation_request->BeginNavigation(info.Pass(), params.request_body);
+  // Then notify the RenderFrameHostManager so it can speculatively create a
+  // RenderFrameHost (and potentially a new renderer process) in parallel.
+  frame_tree_node->render_manager()->BeginNavigation(common_params);
 }
 
 // PlzNavigate
 void NavigatorImpl::CommitNavigation(FrameTreeNode* frame_tree_node,
                                      ResourceResponse* response,
                                      scoped_ptr<StreamHandle> body) {
   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableBrowserSideNavigation));
 
   // HTTP 204 (No Content) and HTTP 205 (Reset Content) responses should not
@@ skipping 20 matching lines @@
   render_frame_host->CommitNavigation(response, body.Pass(),
                                       navigation_request->common_params(),
                                       navigation_request->commit_params());
 }
 
 // PlzNavigate
 void NavigatorImpl::CancelNavigation(FrameTreeNode* frame_tree_node) {
   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableBrowserSideNavigation));
   navigation_request_map_.erase(frame_tree_node->frame_tree_node_id());
+  // TODO(carlosk): move this cleanup into the NavigationRequest destructor once
+  // we properly cancel ongoing navigations.
+  frame_tree_node->render_manager()->CleanUpNavigation();
 }
 
 // PlzNavigate
 NavigationRequest* NavigatorImpl::GetNavigationRequestForNodeForTesting(
     FrameTreeNode* frame_tree_node) {
   return navigation_request_map_.get(frame_tree_node->frame_tree_node_id());
 }
 
 void NavigatorImpl::LogResourceRequestTime(
     base::TimeTicks timestamp, const GURL& url) {
@@ skipping 129 matching lines @@
         "Navigation.TimeToCommit_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_commit);
     UMA_HISTOGRAM_TIMES(
         "Navigation.TimeToURLJobStart_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_network);
   }
   navigation_data_.reset();
 }
 
 }  // namespace content