[FastTextAutosizer] Enable FastTextAutosizer on tot/dev by default

content/child/runtime_features.cc

 // Copyright 2013 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/child/runtime_features.h"
 
 #include "base/command_line.h"
 #include "content/common/content_switches_internal.h"
 #include "content/public/common/content_switches.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
@@ skipping 139 matching lines @@
 
   if (command_line.HasSwitch(switches::kEnableHTMLImports))
     WebRuntimeFeatures::enableHTMLImports(true);
 
   if (command_line.HasSwitch(switches::kEnableOverlayFullscreenVideo))
     WebRuntimeFeatures::enableOverlayFullscreenVideo(true);
 
   if (ui::IsOverlayScrollbarEnabled())
     WebRuntimeFeatures::enableOverlayScrollbars(true);
 
-  if (command_line.HasSwitch(switches::kEnableFastTextAutosizing))
+  if (command_line.HasSwitch(switches::kEnableFastTextAutosizing)
+      && !command_line.HasSwitch(switches::kDisableFastTextAutosizing))
     WebRuntimeFeatures::enableFastTextAutosizing(true);
 
   if (command_line.HasSwitch(switches::kDisableRepaintAfterLayout))
     WebRuntimeFeatures::enableRepaintAfterLayout(false);
 
   if (command_line.HasSwitch(switches::kEnableRepaintAfterLayout))
     WebRuntimeFeatures::enableRepaintAfterLayout(true);
 
   if (command_line.HasSwitch(switches::kEnableTargetedStyleRecalc))
     WebRuntimeFeatures::enableTargetedStyleRecalc(true);
 
   if (command_line.HasSwitch(switches::kEnableBleedingEdgeRenderingFastPaths))
     WebRuntimeFeatures::enableBleedingEdgeFastPaths(true);
 }
 
 }  // namespace content