Add command line flag to force all extensions to have a browser action.

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 d9d398775d51b738c7061b6ced5a334b41ed6ca8..8575cc6db72974fc7109a32c392f6c09e6292cb0 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5148,6 +5148,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_EXPERIMENTAL_EXTENSION_APIS_DESCRIPTION" desc="Description of the 'Experimental Extension APIs' lab.">
         Enables experimental extension APIs. Note that the extension gallery doesn't allow you to upload extensions that use experimental APIs.
       </message>
+      <message name="IDS_FLAGS_BROWSER_ACTIONS_FOR_ALL_NAME" desc="Name of the 'Browser actions for all extensions' lab.">
+        Browser actions for all extensions
+      </message>
+      <message name="IDS_FLAGS_BROWSER_ACTIONS_FOR_ALL_DESCRIPTION" desc="Description of the 'Browser action for all extensions' lab.">
+        Enables browser actions for all extensions. This generates browser actions for any extensions that don't declare them.
+      </message>
       <message name="IDS_FLAGS_APPS_NEW_INSTALL_BUBBLE_NAME" desc="Name of the 'New Apps Install Bubble' lab">
         New Apps Install Bubble
       </message>