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

content/public/common/content_features.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.
 
 // This file defines all the public base::FeatureList features for the content
 // module.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_
 
@@ skipping 32 matching lines @@
 CONTENT_EXPORT extern const base::Feature kMediaDocumentDownloadButton;
 CONTENT_EXPORT extern const base::Feature kMediaStreamOldVideoConstraints;
 CONTENT_EXPORT extern const base::Feature kMemoryCoordinator;
 CONTENT_EXPORT extern const base::Feature kNotificationContentImage;
 CONTENT_EXPORT extern const base::Feature kMainThreadBusyScrollIntervention;
 CONTENT_EXPORT extern const base::Feature kOffMainThreadFetch;
 CONTENT_EXPORT extern const base::Feature kOriginTrials;
 CONTENT_EXPORT extern const base::Feature kParallelDownloading;
 CONTENT_EXPORT extern const base::Feature kPassiveDocumentEventListeners;
 CONTENT_EXPORT extern const base::Feature kPassiveEventListenersDueToFling;
+CONTENT_EXPORT extern const base::Feature kPredictorPreconnect;
 CONTENT_EXPORT extern const base::Feature kPepper3DImageChromium;
 CONTENT_EXPORT extern const base::Feature kPointerEvents;
 CONTENT_EXPORT extern const base::Feature kPurgeAndSuspend;
 CONTENT_EXPORT extern const base::Feature kRafAlignedMouseInputEvents;
 CONTENT_EXPORT extern const base::Feature kRafAlignedTouchInputEvents;
 CONTENT_EXPORT extern const base::Feature kRenderingPipelineThrottling;
 CONTENT_EXPORT extern const base::Feature
     kRequireSecureOriginsForPepperMediaRequests;
 CONTENT_EXPORT extern const base::Feature kScrollAnchoring;
 CONTENT_EXPORT extern const base::Feature kServiceWorkerNavigationPreload;
@@ skipping 31 matching lines @@
 #if defined(OS_WIN)
 CONTENT_EXPORT extern const base::Feature kWinSboxDisableExtensionPoints;
 #endif  // defined(OS_WIN)
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace features
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_