Add enable-app-shims to chrome://flags.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index d7d7d1f71a708db086d98fb5687a7447439c15ea..353f583b02c176303cd078ce5e1224a7880fa245 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7206,6 +7206,14 @@ Keep your key file in a safe place. You will need it to create new versions of y
         Make the menu button touch-draggable so that users can execute a menu item (e.g., New Tab, Settings,...) by a single touch.
         If the popup list is too long to display at once, touch-dragging at the top or the bottom scrolls the list.
       </message>
+      <if expr="is_macosx">
+        <message name="IDS_FLAGS_ENABLE_APP_SHIMS_NAME" desc="Title for the flag to enable shortcuts for packaged apps to be added to Applications and to appear in the dock.">
+          Enable packaged app shortcuts.
+        </message>
+        <message name="IDS_FLAGS_ENABLE_APP_SHIMS_DESCRIPTION" desc="Description for the flag to enable packaged apps appearing in the dock in OSX.">
+          Enables packaged app shortcuts to be added to Applications and to appear in the dock.
+        </message>
+      </if>
 
       <!-- Crashes -->
       <message name="IDS_CRASHES_TITLE" desc="Title for the chrome://crashes page.">