Add Cross Process Guests feature switch to about:flags.

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2101 matching lines @@
      FEATURE_VALUE_TYPE(features::kConsistentOmniboxGeolocation)},
     {"concurrent-background-loading-on-svelte",
      IDS_FLAGS_OFFLINE_PAGES_SVELTE_CONCURRENT_LOADING_NAME,
      IDS_FLAGS_OFFLINE_PAGES_SVELTE_CONCURRENT_LOADING_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(
          offline_pages::kOfflinePagesSvelteConcurrentLoadingFeature)},
 #endif
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
+    {"cross-process-guests", IDS_FLAGS_CROSS_PROCESS_GUEST_VIEW_ISOLATION_NAME,
+     IDS_FLAGS_CROSS_PROCESS_GUEST_VIEW_ISOLATION_DESCRIPTION, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kGuestViewCrossProcessFrames)},
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
 
   static FlagsStateSingleton* GetInstance() {
     return base::Singleton<FlagsStateSingleton>::get();
@@ skipping 185 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags