Stop disabling force_compositing_mode for background RenderViews.

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 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/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 295 matching lines @@
   params.view_id = GetRoutingID();
   params.main_frame_routing_id = main_frame_routing_id_;
   params.surface_id = surface_id();
   params.session_storage_namespace_id =
       delegate_->GetSessionStorageNamespace(instance_)->id();
   params.frame_name = frame_name;
   // Ensure the RenderView sets its opener correctly.
   params.opener_route_id = opener_route_id;
   params.swapped_out = !IsRVHStateActive(rvh_state_);
   params.hidden = is_hidden();
+  params.background =
+      GetContentClient()->browser()->IsRenderViewHostForBackground(this);
   params.next_page_id = next_page_id;
   GetWebScreenInfo(&params.screen_info);
   params.accessibility_mode = accessibility_mode();
 
   Send(new ViewMsg_New(params));
 
   // If it's enabled, tell the renderer to set up the Javascript bindings for
   // sending messages back to the browser.
   if (GetProcess()->IsGuest())
     DCHECK_EQ(0, enabled_bindings_);
@@ skipping 1524 matching lines @@
   return true;
 }
 
 void RenderViewHostImpl::AttachToFrameTree() {
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 }  // namespace content