Revert of Disable SPInvalidation by default

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 243 matching lines @@
   if (command_line.HasSwitch(switches::kEnableWebFontsInterventionTrigger))
     WebRuntimeFeatures::enableWebFontsInterventionTrigger(true);
 
   WebRuntimeFeatures::enableScrollAnchoring(
       base::FeatureList::IsEnabled(features::kScrollAnchoring) ||
       enableExperimentalWebPlatformFeatures);
 
   if (command_line.HasSwitch(switches::kEnableSlimmingPaintV2))
     WebRuntimeFeatures::enableSlimmingPaintV2(true);
 
-  if (base::FeatureList::IsEnabled(features::kSlimmingPaintInvalidation))
-    WebRuntimeFeatures::enableSlimmingPaintInvalidation(true);
+  WebRuntimeFeatures::enableSlimmingPaintInvalidation(
+      base::FeatureList::IsEnabled(features::kSlimmingPaintInvalidation));
 
   if (command_line.HasSwitch(switches::kEnableSlimmingPaintInvalidation))
     WebRuntimeFeatures::enableSlimmingPaintInvalidation(true);
 
   if (command_line.HasSwitch(switches::kDisableSlimmingPaintInvalidation))
     WebRuntimeFeatures::enableSlimmingPaintInvalidation(false);
 
   if (base::FeatureList::IsEnabled(features::kDocumentWriteEvaluator))
     WebRuntimeFeatures::enableDocumentWriteEvaluator(true);
 
@@ skipping 102 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