Switch use-zoom-for-dsf flag to use tri-value flags

content/common/content_switches_internal.cc

 // Copyright (c) 2014 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/common/content_switches_internal.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 66 matching lines @@
   } else if (v8_cache_options == "parse") {
     return V8_CACHE_OPTIONS_PARSE;
   } else if (v8_cache_options == "code") {
     return V8_CACHE_OPTIONS_CODE;
   } else {
     return V8_CACHE_OPTIONS_DEFAULT;
   }
 }
 
 bool IsUseZoomForDSFEnabled() {
-  static bool enabled = base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableUseZoomForDSF);
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  bool enabled = command_line->HasSwitch(switches::kEnableUseZoomForDSF) &&
+                 command_line->GetSwitchValueASCII(
+                     switches::kEnableUseZoomForDSF) != "false";
+
   return enabled;
 }
 
 } // namespace content