Support base::Feature entries in chrome://flags.

chrome/browser/about_flags.h

 // 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.
 
 #ifndef CHROME_BROWSER_ABOUT_FLAGS_H_
 #define CHROME_BROWSER_ABOUT_FLAGS_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 38 matching lines @@
     // feature (i.e. no command line option). For MULTI_VALUE entries, the
     // command_line of the FeatureEntry is not used. If the experiment is
     // enabled the command line of the selected Choice is enabled.
     MULTI_VALUE,
 
     // The feature has three possible values: Default, Enabled and Disabled.
     // This should be used for features that may have their own logic to decide
     // if the feature should be on when not explicitly specified via about
     // flags - for example via FieldTrials.
     ENABLE_DISABLE_VALUE,
+
+    // Corresponds to a base::Feature, per base/feature_list.h. The entry will
+    // have three states: Default, Enabled, Disabled. When not specified or set
+    // to Default, the normal default value of the feature is used.
+    FEATURE_VALUE,
   };
 
   // Used for MULTI_VALUE types to describe one of the possible values the user
   // can select.
   struct Choice {
     // ID of the message containing the choice name.
     int description_id;
 
     // Command line switch and value to enabled for this choice.
     const char* command_line_switch;
@@ skipping 25 matching lines @@
   // This is used if type is SINGLE_VALUE or ENABLE_DISABLE_VALUE.
   const char* command_line_switch;
   // Simple switches that have no value should use "" for command_line_value.
   const char* command_line_value;
 
   // For ENABLE_DISABLE_VALUE, the command line switch and value to explicitly
   // disable the feature.
   const char* disable_command_line_switch;
   const char* disable_command_line_value;
 
+  // For FEATURE_VALUE, the name of the base::Feature this entry corresponds to.
+  const char* feature_name;
+
   // This is used if type is MULTI_VALUE.
   const Choice* choices;
 
   // Number of |choices|.
   // This is used if type is MULTI_VALUE.
   int num_choices;
 
   // Returns the name used in prefs for the choice at the specified |index|.
   std::string NameForChoice(int index) const;
 
@@ skipping 88 matching lines @@
 
 // This value is reported as switch histogram ID if switch name has unknown
 // format.
 extern const base::HistogramBase::Sample kBadSwitchFormatHistogramId;
 
 }  // namespace testing
 
 }  // namespace about_flags
 
 #endif  // CHROME_BROWSER_ABOUT_FLAGS_H_