Add support for backgrounding processes on the Mac

content/public/common/content_switches.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
 #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.
 const char kAcceleratedCanvas2dMSAASampleCount[] = "canvas-msaa-sample-count";
@@ skipping 947 matching lines @@
 // Linux speech service. Because it's buggy, the user must explicitly
 // enable it so that visiting a random webpage can't cause instability.
 const char kEnableSpeechDispatcher[] = "enable-speech-dispatcher";
 #endif
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 // Disables support for Core Animation plugins. This is triggered when
 // accelerated compositing is disabled. See http://crbug.com/122430.
 const char kDisableCoreAnimationPlugins[] =
     "disable-core-animation-plugins";
+// Allow the browser to background renderer processes on the Mac. See
+// http://crbug.com/460102 .
+const char kBackgroundMacRendererProcesses[] =
+    "background-mac-renderer-processes";
 #endif
 
 #if defined(OS_WIN)
 // Device scale factor passed to certain processes like renderers, etc.
 const char kDeviceScaleFactor[]     = "device-scale-factor";
 
 // Disable the Legacy Window which corresponds to the size of the WebContents.
 const char kDisableLegacyIntermediateWindow[] = "disable-legacy-window";
 
 // Enables or disables the Win32K process mitigation policy for renderer
 // processes which prevents them from invoking user32 and gdi32 system calls
 // which enter the kernel. This is only supported on Windows 8 and beyond.
 const char kDisableWin32kRendererLockDown[] =
     "disable-win32k-renderer-lockdown";
 const char kEnableWin32kRendererLockDown[] =
     "enable-win32k-renderer-lockdown";
 
 // DirectWrite FontCache is shared by browser to renderers using shared memory.
 // This switch allows specifying suffix to shared memory section name to avoid
 // clashes between different instances of Chrome.
 const char kFontCacheSharedMemSuffix[] = "font-cache-shared-mem-suffix";
 #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