WebUI Settings: Add a finch flag for content settings redesign

Redesigning the content settings pages with radio buttons and new
strings, behind this flag.

Bug: 1113642
Change-Id: I882f91eca5e353453335838ee7a26188eaa4d780
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316162
Commit-Queue: Tymofii Chudakov <[email protected]>
Reviewed-by: dpapad <[email protected]>
Reviewed-by: Sean Harrison <[email protected]>
Cr-Commit-Position: refs/heads/master@{#795426}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 604facc..7eaf593 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -6182,6 +6182,11 @@
      flag_descriptions::kH264DecoderBufferIsCompleteFrameDescription, kOsAll,
      FEATURE_VALUE_TYPE(media::kH264DecoderBufferIsCompleteFrame)},
 
+    {"content-settings-redesign",
+     flag_descriptions::kContentSettingsRedesignName,
+     flag_descriptions::kContentSettingsRedesignDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kContentSettingsRedesign)}
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the