Move ~200 Feature objects to read-only memory in Windows builds

base/feature_list.h

 // Copyright 2015 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 BASE_FEATURE_LIST_H_
 #define BASE_FEATURE_LIST_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 14 matching lines @@
 enum FeatureState {
   FEATURE_DISABLED_BY_DEFAULT,
   FEATURE_ENABLED_BY_DEFAULT,
 };
 
 // The Feature struct is used to define the default state for a feature. See
 // comment below for more details. There must only ever be one struct instance
 // for a given feature name - generally defined as a constant global variable or
 // file static.
 struct BASE_EXPORT Feature {
+  constexpr Feature(const char* name, FeatureState default_state)
+      : name(name), default_state(default_state) {}
   // The name of the feature. This should be unique to each feature and is used
   // for enabling/disabling features via command line flags and experiments.
   const char* const name;
 
   // The default state (i.e. enabled or disabled) for this feature.
   const FeatureState default_state;
 };
 
 // The FeatureList class is used to determine whether a given feature is on or
 // off. It provides an authoritative answer, taking into account command-line
@@ skipping 229 matching lines @@
 
   // Whether this object has been initialized from command line.
   bool initialized_from_command_line_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(FeatureList);
 };
 
 }  // namespace base
 
 #endif  // BASE_FEATURE_LIST_H_