Display Cutout: Add feature

Add a 'DisplayCutoutAPI' feature that will switch on the
viewport-fit code (and the in future css safe-area-* code).

BUG=838400

Change-Id: I6a8f95b1a4cef33349787779ff2993a0f0453bff
Reviewed-on: https://chromium-review.googlesource.com/1043078
Commit-Queue: Becca Hughes <[email protected]>
Reviewed-by: Pavel Feldman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#556224}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index cfc2239..80b628c 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3919,6 +3919,12 @@
      flag_descriptions::kNtpUIMdDescription, kOsDesktop,
      FEATURE_VALUE_TYPE(features::kNtpUIMd)},
 
+#if defined(OS_ANDROID)
+    {"enable-display-cutout-api", flag_descriptions::kDisplayCutoutAPIName,
+     flag_descriptions::kDisplayCutoutAPIDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(features::kDisplayCutoutAPI)},
+#endif  // OS_ANDROID
+
     // 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