Convert --enable-md-history to a feature flag.

chrome/common/chrome_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 "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 
@@ skipping 408 matching lines @@
     "enable-extension-activity-log-testing";
 
 // Enable the fast unload controller, which speeds up tab/window close by
 // running a tab's onunload js handler independently of the GUI -
 // crbug.com/142458 .
 const char kEnableFastUnload[] = "enable-fast-unload";
 
 // Enables the Material Design version of chrome://extensions.
 const char kEnableMaterialDesignExtensions[] = "enable-md-extensions";
 
-// Enables the Material Design version of chrome://history.
-const char kEnableMaterialDesignHistory[] = "enable-md-history";
-
 // Enables the Material Design policy page at chrome://md-policy.
 const char kEnableMaterialDesignPolicyPage[]  = "enable-md-policy-page";
 
 // Runs the Native Client inside the renderer process and enables GPU plugin
 // (internally adds lEnableGpuPlugin to the command line).
 const char kEnableNaCl[]                    = "enable-nacl";
 
 // Enables the use of native notifications instead of using the Chrome based
 // ones.
 const char kEnableNativeNotifications[] = "enable-native-notifications";
@@ skipping 246 matching lines @@
 
 #if !defined(GOOGLE_CHROME_BUILD)
 // Enables a live-reload for local NTP resources. This only works when Chrome
 // is running from a Chrome source directory.
 const char kLocalNtpReload[]                = "local-ntp-reload";
 #endif
 
 // Makes Chrome default browser
 const char kMakeDefaultBrowser[]            = "make-default-browser";
 
+// Enables or disables the Material Design version of chrome:://history.
+const base::Feature kMaterialDesignHistoryFeature {
+  "UsesMaterialDesignHistory", base::FEATURE_DISABLED_BY_DEFAULT
+};
+
 // Forces the maximum disk space to be used by the media cache, in bytes.
 const char kMediaCacheSize[]                = "media-cache-size";
 
 // Enables Media Router.
 const char kMediaRouter[]                   = "media-router";
 
 // Enables histograming of tasks served by MessageLoop. See
 // about:histograms/Loop for results, which show frequency of messages on each
 // thread, including APC count, object signalling count, etc.
 const char kMessageLoopHistogrammer[]       = "message-loop-histogrammer";
@@ skipping 632 matching lines @@
          !base::CommandLine::ForCurrentProcess()->HasSwitch(
              ::switches::kDisableAboutInSettings);
 }
 
 bool MdExtensionsEnabled() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       ::switches::kEnableMaterialDesignExtensions);
 }
 
 bool MdHistoryEnabled() {
-  return base::CommandLine::ForCurrentProcess()->HasSwitch(
-      ::switches::kEnableMaterialDesignHistory);
+  return base::FeatureList::IsEnabled(
+      ::switches::kMaterialDesignHistoryFeature);
 }
 
 bool MdPolicyPageEnabled() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       ::switches::kEnableMaterialDesignPolicyPage);
 }
 
 bool SettingsWindowEnabled() {
 #if defined(OS_CHROMEOS)
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(
@@ skipping 24 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches