Keep WKWebView control group users in the control group

ios/chrome/browser/experimental_flags.h

 // Copyright 2014 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.
 
 #ifndef IOS_CHROME_BROWSER_EXPERIMENTAL_FLAGS_H_
 #define IOS_CHROME_BROWSER_EXPERIMENTAL_FLAGS_H_
 
 #include <string>
 
 // This file can be empty. Its purpose is to contain the relatively short lived
@@ skipping 14 matching lines @@
 // only whether the trial state will be checked in the default state.
 void SetWKWebViewTrialEligibility(bool eligible);
 
 // Whether the lru snapshot cache experiment is enabled.
 bool IsLRUSnapshotCacheEnabled();
 
 // Whether the app uses WKWebView instead of UIWebView.
 // The returned value will not change within a given session.
 bool IsWKWebViewEnabled();
 
+// Whether the user would be put into a control group for the WKWebView
+// experiment assuming they were eligible. Calling this will *not* activate a
+// trial, so is safe to call without checking eligibility.
+bool IsTargetedToWKWebViewExperimentControlGroup();
+
+// Whether the user is part of a control group for the WKWebView experiment.
+bool IsInWKWebViewExperimentControlGroup();
+
 // Returns a string containing extra params that should be sent along with
 // omnibox search requests.  The returned value contains a leading "&".
 std::string GetWKWebViewSearchParams();
 
 // Whether keyboard commands are supported.
 bool AreKeyboardCommandsEnabled();
 
 // Whether viewing and copying passwords is enabled.
 bool IsViewCopyPasswordsEnabled();
 
 // Whether password generation is enabled.
 bool IsPasswordGenerationEnabled();
 
 // Whether password generation fields are determined using local heuristics
 // only.
 bool UseOnlyLocalHeuristicsForPasswordGeneration();
 
 }  // namespace experimental_flags
 
 #endif  // IOS_CHROME_BROWSER_EXPERIMENTAL_FLAGS_H_