Revert of Revert of cc: Default threaded GPU rasterization to ON.

content/browser/gpu/compositor_util.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/browser/gpu/compositor_util.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 283 matching lines @@
 
 bool IsThreadedGpuRasterizationEnabled() {
   if (!IsImplSidePaintingEnabled())
     return false;
 
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
   if (command_line.HasSwitch(switches::kDisableThreadedGpuRasterization))
     return false;
-  if (command_line.HasSwitch(switches::kEnableThreadedGpuRasterization))
-    return true;
 
-  return false;
+  return true;
 }
 
 bool UseSurfacesEnabled() {
 #if defined(OS_ANDROID)
   return false;
 #else
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
   return command_line.HasSwitch(switches::kUseSurfaces);
@@ skipping 115 matching lines @@
     }
   }
   return problem_list;
 }
 
 std::vector<std::string> GetDriverBugWorkarounds() {
   return GpuDataManagerImpl::GetInstance()->GetDriverBugWorkarounds();
 }
 
 }  // namespace content