[Feature Policy] Add command-line flag and about://flags interface for Feature Policy

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 <vector>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 46 matching lines @@
 }
 
 void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
     const base::CommandLine& command_line) {
   if (command_line.HasSwitch(switches::kEnableExperimentalWebPlatformFeatures))
     WebRuntimeFeatures::enableExperimentalFeatures(true);
 
   WebRuntimeFeatures::enableOriginTrials(
       base::FeatureList::IsEnabled(features::kOriginTrials));
 
+  WebRuntimeFeatures::enableFeaturePolicy(
+      base::FeatureList::IsEnabled(features::kFeaturePolicy));
+
   if (command_line.HasSwitch(switches::kEnableWebBluetooth))
     WebRuntimeFeatures::enableWebBluetooth(true);
 
   if (!base::FeatureList::IsEnabled(features::kWebUsb))
     WebRuntimeFeatures::enableWebUsb(false);
 
   SetRuntimeFeatureDefaultsForPlatform();
 
   if (command_line.HasSwitch(switches::kDisableDatabases))
     WebRuntimeFeatures::enableDatabase(false);
@@ skipping 205 matching lines @@
   if (command_line.HasSwitch(switches::kDisableBlinkFeatures)) {
     std::vector<std::string> disabled_features = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kDisableBlinkFeatures),
         ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
     for (const std::string& feature : disabled_features)
       WebRuntimeFeatures::enableFeatureFromString(feature, false);
   }
 }
 
 }  // namespace content