Add MacRTL feature to flags

tools/metrics/histograms/enums.xml

Index: tools/metrics/histograms/enums.xml
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 982d45e15b47f7446ee160373398221146738fbc..3bbabf070e907db7f14889194c2ed898c66102fb 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -21194,6 +21194,7 @@ from previous Chrome versions.
   <int value="-1943507605" label="enable-new-video-renderer"/>
   <int value="-1941852572" label="floating-virtual-keyboard"/>
   <int value="-1940806558" label="enable-syncfs-directory-operation"/>
+  <int value="-1940377152" label="MacRTL:enabled"/>
   <int value="-1940291343" label="SpeculativeResourcePrefetching:enabled"/>
   <int value="-1938263248" label="enable-extension-info-dialog"/>
   <int value="-1937077699" label="http-form-warning"/>
@@ -21538,6 +21539,7 @@ from previous Chrome versions.
   <int value="-697751423" label="disable-quickoffice-component-app"/>
   <int value="-684900739" label="disable-merge-key-char-events"/>
   <int value="-684223908" label="enable-android-wallpapers-app"/>
+  <int value="-680589442" label="MacRTL:disabled"/>
   <int value="-667517406" label="overscroll-history-navigation"/>
   <int value="-661978438" label="enable-data-reduction-proxy-lo-fi"/>
   <int value="-660160292" label="enable-apps-show-on-first-paint"/>