content: Improve thread priority for raster threads.

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 "build/build_config.h"
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
@@ skipping 839 matching lines @@
 
 // Texture target for CHROMIUM_image backed content textures.
 const char kContentImageTextureTarget[] = "content-image-texture-target";
 
 // Texture target for CHROMIUM_image backed video frame textures.
 const char kVideoImageTextureTarget[] = "video-image-texture-target";
 
 // Set when Chromium should use a mobile user agent.
 const char kUseMobileUserAgent[] = "use-mobile-user-agent";
 
-// Use normal priority for tile task worker threads.  Otherwise they may
-// be run at background priority on some platforms.
-const char kUseNormalPriorityForTileTaskWorkerThreads[] =
-    "use-normal-priority-for-tile-task-worker-threads";
-
 // Use remote compositor for the renderer.
 const char kUseRemoteCompositing[] = "use-remote-compositing";
 
 // The contents of this flag are prepended to the utility process command line.
 // Useful values might be "valgrind" or "xterm -e gdb --args".
 const char kUtilityCmdPrefix[]              = "utility-cmd-prefix";
 
 // Causes the process to run as a utility subprocess.
 const char kUtilityProcess[]                = "utility";
 
@@ skipping 179 matching lines @@
 const char kMemoryPressureThresholdsMb[] = "memory-pressure-thresholds-mb";
 
 // Enables the exporting of the tracing events to ETW. This is only supported on
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches