Add support for backgrounding processes on the Mac

content/public/common/content_switches.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/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 205 matching lines @@
 // Taints all <canvas> elements, regardless of origin.
 const char kDisableReadingFromCanvas[]      = "disable-reading-from-canvas";
 
 // Disables remote web font support. SVG font should always work whether this
 // option is specified or not.
 const char kDisableRemoteFonts[]            = "disable-remote-fonts";
 
 // Turns off the accessibility in the renderer.
 const char kDisableRendererAccessibility[]  = "disable-renderer-accessibility";
 
+// Prevent renderer process backgrounding when set.
+const char kDisableRendererBackgrounding[]  = "disable-renderer-backgrounding";
+
 // Disable the seccomp filter sandbox (seccomp-bpf) (Linux only).
 const char kDisableSeccompFilterSandbox[]   = "disable-seccomp-filter-sandbox";
 
 // Disable the setuid sandbox (Linux only).
 const char kDisableSetuidSandbox[]          = "disable-setuid-sandbox";
 
 // Disable shared workers.
 const char kDisableSharedWorkers[]          = "disable-shared-workers";
 
 // Disable smooth scrolling for testing.
@@ skipping 758 matching lines @@
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Enables the use of NPAPI plugins.
 const char kEnableNpapi[]                   = "enable-npapi";
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches