[Not for review] Add TRACE_EVENTs and chrome://flags for preconnect

content/public/common/content_features.cc

 // 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.
 
 #include "build/build_config.h"
 #include "content/public/common/content_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
@@ skipping 149 matching lines @@
 
 // Whether document level event listeners should default 'passive' to true.
 const base::Feature kPassiveDocumentEventListeners{
     "PassiveDocumentEventListeners", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Whether we should force a touchstart and first touchmove per scroll event
 // listeners to be non-blocking during fling.
 const base::Feature kPassiveEventListenersDueToFling{
     "PassiveEventListenersDueToFling", base::FEATURE_ENABLED_BY_DEFAULT};
 
+const base::Feature kPredictorPreconnect{"PredictorPreconnect",
+                                         base::FEATURE_ENABLED_BY_DEFAULT};
+
 // Pointer events support.
 const base::Feature kPointerEvents{"PointerEvent",
                                    base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables Purge+Throttle on platforms except Android and MacOS.
 // (Android) Purge+Throttle depends on TabManager, but TabManager doesn't
 // support Android. Enable after Android is supported.
 // (MacOS X) Enable after Purge+Throttle handles memory pressure signals
 // send by OS correctly.
 const base::Feature kPurgeAndSuspend {
@@ skipping 170 matching lines @@
 #endif
 
 #if defined(OS_WIN)
 // Emergency "off switch" for new Windows sandbox security mitigation,
 // sandbox::MITIGATION_EXTENSION_POINT_DISABLE.
 const base::Feature kWinSboxDisableExtensionPoints{
     "WinSboxDisableExtensionPoint", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 }  // namespace features