Add switches to enable the unified permission manager on Android.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index f488aedc3ccf5320dd2f638ac3f510690074b021..459a37ba05412a2c3030317e2509e8b3bcbc29a2 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1819,6 +1819,13 @@ const FeatureEntry kFeatureEntries[] = {
       IDS_FLAGS_EXPERIMENTAL_POINTER_EVENT_DESCRIPTION,
       kOsAll,
       FEATURE_VALUE_TYPE(features::kPointerEvents)},
+#if defined(OS_ANDROID)
+    {"enable-unified-permission-manager",
+     IDS_FLAGS_UNIFIED_PERMISSION_MANAGER_NAME,
+     IDS_FLAGS_UNIFIED_PERMISSION_MANAGER_DESCRIPTION, kOsAndroid,
+     SINGLE_VALUE_TYPE(switches::kEnableUnifiedPermissionManager)},
+#endif  // defined(OS_ANDROID)
+
     // 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.