PlzNavigate: Speculatively spawns a renderer process for navigations.

content/browser/frame_host/render_frame_host_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/render_frame_host_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
@@ skipping 1383 matching lines @@
 
 // PlzNavigate
 void RenderFrameHostImpl::CommitNavigation(
     ResourceResponse* response,
     scoped_ptr<StreamHandle> body,
     const CommonNavigationParams& common_params,
     const CommitNavigationParams& commit_params) {
   // TODO(clamy): Check if we have to add security checks for the browser plugin
   // guests.
 
+  // Get back to a clean state, in case we start a new navigation without
+  // completing a RFH swap or unload handler.
+  SetState(RenderFrameHostImpl::STATE_DEFAULT);
+
   Send(new FrameMsg_CommitNavigation(
       routing_id_, response->head, body->GetURL(),
       common_params, commit_params));
   // TODO(clamy): Check if we should start the throbber for non javascript urls
   // here.
 
   // TODO(clamy): Release the stream handle once the renderer has finished
   // reading it.
   stream_handle_ = body.Pass();
 }
@@ skipping 194 matching lines @@
 void RenderFrameHostImpl::DidUseGeolocationPermission() {
   RenderFrameHost* top_frame = frame_tree_node()->frame_tree()->GetMainFrame();
   GetContentClient()->browser()->RegisterPermissionUsage(
       PERMISSION_GEOLOCATION,
       delegate_->GetAsWebContents(),
       GetLastCommittedURL().GetOrigin(),
       top_frame->GetLastCommittedURL().GetOrigin());
 }
 
 }  // namespace content