Set an initial background for RenderFrameHosts during commit.

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 <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 2189 matching lines @@
   } else {
     // PlzNavigate
     DCHECK(speculative_render_frame_host_);
     old_render_frame_host =
         SetRenderFrameHost(std::move(speculative_render_frame_host_));
   }
 
   // The process will no longer try to exit, so we can decrement the count.
   render_frame_host_->GetProcess()->RemovePendingView();
 
+  // Save off the old background color before possibly deleting the
+  // old RenderWidgetHostView.
+  SkColor old_background_color = SK_ColorWHITE;
+  bool has_old_background_color = false;
+  if (old_render_frame_host->GetView()) {
+    has_old_background_color = true;
+    old_background_color = old_render_frame_host->GetView()->background_color();
+  }
+
   // The RenderViewHost keeps track of the main RenderFrameHost routing id.
   // If this is committing a main frame navigation, update it and set the
   // routing id in the RenderViewHost associated with the old RenderFrameHost
   // to MSG_ROUTING_NONE.
   if (is_main_frame) {
     RenderViewHostImpl* rvh = render_frame_host_->render_view_host();
     rvh->set_main_frame_routing_id(render_frame_host_->routing_id());
 
     // If we are reusing the RenderViewHost, we need to create the
     // RenderWidgetHostView if this is the main frame.
@@ skipping 56 matching lines @@
       frame_tree_node_->frame_tree()->SetPageFocus(
           render_frame_host_->GetSiteInstance(), true);
     }
   }
 
   // Notify that we've swapped RenderFrameHosts. We do this before shutting down
   // the RFH so that we can clean up RendererResources related to the RFH first.
   delegate_->NotifySwappedFromRenderManager(
       old_render_frame_host.get(), render_frame_host_.get(), is_main_frame);
 
+  if (has_old_background_color && render_frame_host_->GetView())
+    render_frame_host_->GetView()->SetBackgroundColor(old_background_color);
+
   // Swap out the old frame now that the new one is visible.
   // This will swap it out and schedule it for deletion when the swap out ack
   // arrives (or immediately if the process isn't live).
   SwapOutOldFrame(std::move(old_render_frame_host));
 
   // Since the new RenderFrameHost is now committed, there must be no proxies
   // for its SiteInstance. Delete any existing ones.
   DeleteRenderFrameProxyHost(render_frame_host_->GetSiteInstance());
 
   // If this is a subframe, it should have a CrossProcessFrameConnector
@@ skipping 518 matching lines @@
                                              resolved_url)) {
     DCHECK(!dest_instance ||
            dest_instance == render_frame_host_->GetSiteInstance());
     return false;
   }
 
   return true;
 }
 
 }  // namespace content