[DocWriteBlocking] Add feature to block doc.written scripts if 2g-like network

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 222 matching lines @@
   // Note that it might already by true for OS_ANDROID, above.  This is for
   // non-android versions.
   if (base::FeatureList::IsEnabled(features::kNewMediaPlaybackUi))
     WebRuntimeFeatures::enableNewMediaPlaybackUi(true);
 
   if (base::FeatureList::IsEnabled(
           features::kNonValidatingReloadOnNormalReload)) {
     WebRuntimeFeatures::enableReloadwithoutSubResourceCacheRevalidation(true);
   }
 
+  if (base::FeatureList::IsEnabled(features::kBlockDocWriteIfEffectively2G)) {
+    WebRuntimeFeatures::enableBlockDocWriteIfEffectively2G(true);
+  }
+
   if (base::FeatureList::IsEnabled(features::kDocumentWriteEvaluator))
     WebRuntimeFeatures::enableDocumentWriteEvaluator(true);
 
   WebRuntimeFeatures::enableMediaDocumentDownloadButton(
       base::FeatureList::IsEnabled(features::kMediaDocumentDownloadButton));
 
   if (base::FeatureList::IsEnabled(features::kPointerEvents))
     WebRuntimeFeatures::enablePointerEvent(true);
 
   if (base::FeatureList::IsEnabled(features::kPointerEventV1SpecCapturing))
@@ skipping 48 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