Use layout test support flag to turn on single thread compositor proxy scheduler

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 214 matching lines @@
 
 // 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";
 
-// For tests, disable single thread scheduler and only manually composite.
-const char kDisableSingleThreadProxyScheduler[] =
-    "disable-single-thread-proxy-scheduler";
-
 // Disable smooth scrolling for testing.
 const char kDisableSmoothScrolling[]        = "disable-smooth-scrolling";
 
 // Disables the use of a 3D software rasterizer.
 const char kDisableSoftwareRasterizer[]     = "disable-software-rasterizer";
 
 // Disables SVG 1.1 DOM.
 const char kDisableSVG1DOM[]                = "disable-svg1dom";
 
 // Disable text blob rendering.
@@ skipping 754 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