Allow backgrounding processes on Mac

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 2786 matching lines @@
     channel_->Unpause(false /* flush */);
 
     if (child_connection_) {
       child_connection_->SetProcessHandle(
           child_process_launcher_->GetProcess().Handle());
     }
 
     // Not all platforms launch processes in the same backgrounded state. Make
     // sure |is_process_backgrounded_| reflects this platform's initial process
     // state.
+#if defined(OS_MACOSX)
+    is_process_backgrounded_ =
+        child_process_launcher_->GetProcess().IsProcessBackgrounded(
+            MachBroker::GetInstance());
+#else
     is_process_backgrounded_ =
         child_process_launcher_->GetProcess().IsProcessBackgrounded();
+#endif  // defined(OS_MACOSX)
 
     // Disable updating process priority on startup for now as it incorrectly
     // results in backgrounding foreground navigations until their first commit
     // is made. A better long term solution would be to be aware of the tab's
     // visibility at this point. https://crbug.com/560446.
     // Except on Android for now because of https://crbug.com/601184 :-(.
 #if defined(OS_ANDROID)
     UpdateProcessPriority();
 #endif
 
@@ skipping 164 matching lines @@
   bad_message::ReceivedBadMessage(render_process_id,
                                   bad_message::RPH_MOJO_PROCESS_ERROR);
 }
 
 void RenderProcessHostImpl::CreateURLLoaderFactory(
     mojo::InterfaceRequest<mojom::URLLoaderFactory> request) {
   URLLoaderFactoryImpl::Create(resource_message_filter_, std::move(request));
 }
 
 }  // namespace content