Give the main frame a RenderWidget.

content/browser/frame_host/render_frame_host_manager.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_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 236 matching lines @@
   ResetProxyHosts();
 
   // Release the WebUI prior to resetting the current RenderFrameHost, as the
   // WebUI accesses the RenderFrameHost during cleanup.
   web_ui_.reset();
 
   // We should always have a current RenderFrameHost except in some tests.
   SetRenderFrameHost(scoped_ptr<RenderFrameHostImpl>());
 }
 
-void RenderFrameHostManager::Init(BrowserContext* browser_context,
-                                  SiteInstance* site_instance,
+void RenderFrameHostManager::Init(SiteInstance* site_instance,
                                   int32 view_routing_id,
                                   int32 frame_routing_id,
                                   int32 widget_routing_id,
                                   int32 surface_id) {
-  // Create a RenderViewHost and RenderFrameHost, once we have an instance.  It
-  // is important to immediately give this SiteInstance to a RenderViewHost so
-  // that the SiteInstance is ref counted.
-  if (!site_instance)
-    site_instance = SiteInstance::Create(browser_context);
-
+  DCHECK(site_instance);
   int flags = delegate_->IsHidden() ? CREATE_RF_HIDDEN : 0;
   SetRenderFrameHost(CreateRenderFrameHost(site_instance, view_routing_id,
                                            frame_routing_id, widget_routing_id,
                                            surface_id, flags));
 
   // Notify the delegate of the creation of the current RenderFrameHost.
   // Do this only for subframes, as the main frame case is taken care of by
   // WebContentsImpl::Init.
   if (!frame_tree_node_->IsMainFrame()) {
     delegate_->NotifySwappedFromRenderManager(
@@ skipping 1455 matching lines @@
       new_render_frame_host->GetProcess()->AddPendingView();
 
       proxy_hosts_->Remove(instance->GetId());
       // NB |proxy| is deleted at this point.
     }
   } else {
     // Create a new RenderFrameHost if we don't find an existing one.
 
     int32 widget_routing_id = MSG_ROUTING_NONE;
     int32 surface_id = 0;
-    // A RenderFrame in a different process from its parent RenderFrame
-    // requires a RenderWidget for input/layout/painting.
-    if (frame_tree_node_->parent() &&
+    // A main RenderFrame, or a RenderFrame in a different process from its
+    // parent RenderFrame requires a RenderWidget for input/layout/painting.
+    if (!frame_tree_node_->parent() ||
         frame_tree_node_->parent()->current_frame_host()->GetSiteInstance() !=
             instance) {
-      CHECK(SiteIsolationPolicy::AreCrossProcessFramesPossible());
+      CHECK(!frame_tree_node_->parent() ||
+            SiteIsolationPolicy::AreCrossProcessFramesPossible());
       widget_routing_id = instance->GetProcess()->GetNextRoutingID();
       surface_id = GpuSurfaceTracker::Get()->AddSurfaceForRenderer(
           instance->GetProcess()->GetID(), widget_routing_id);
     }
 
     new_render_frame_host =
         CreateRenderFrameHost(instance, MSG_ROUTING_NONE, MSG_ROUTING_NONE,
                               widget_routing_id, surface_id, flags);
     RenderViewHostImpl* render_view_host =
         new_render_frame_host->render_view_host();
@@ skipping 815 matching lines @@
 int RenderFrameHostManager::GetOpenerRoutingID(SiteInstance* instance) {
   if (!frame_tree_node_->opener())
     return MSG_ROUTING_NONE;
 
   return frame_tree_node_->opener()
       ->render_manager()
       ->GetRoutingIdForSiteInstance(instance);
 }
 
 }  // namespace content