Set an initial background for RenderFrameHosts during commit.

content/browser/frame_host/render_frame_host_manager.cc

Index: content/browser/frame_host/render_frame_host_manager.cc
diff --git a/content/browser/frame_host/render_frame_host_manager.cc b/content/browser/frame_host/render_frame_host_manager.cc
index 3ec87d36263b55afd0769088dbaf5edcc6980a7e..489fa9a137863238a1fc075757c19d86e3ebf039 100644
--- a/content/browser/frame_host/render_frame_host_manager.cc
+++ b/content/browser/frame_host/render_frame_host_manager.cc
@@ -2168,6 +2168,15 @@ void RenderFrameHostManager::CommitPending() {
   // 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
@@ -2244,6 +2253,9 @@ void RenderFrameHostManager::CommitPending() {
   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).