Browser changes for wiring up RequestContentScript API to shared memory

extensions/common/user_script.h

Index: extensions/common/user_script.h
diff --git a/extensions/common/user_script.h b/extensions/common/user_script.h
index bfa23dd50096f60b6aa1066ca79ccea3d93abc9d..11439f7b548052debeda1b90e2823acb8149fceb 100644
--- a/extensions/common/user_script.h
+++ b/extensions/common/user_script.h
@@ -64,6 +64,8 @@ class UserScript {
                     // particular injection point is guaranteed.
     RUN_DEFERRED,  // The user script's injection was deferred for permissions
                    // reasons, and was executed at a later time.
+    BROWSER_DRIVEN,  // The user script will be injected when triggered by an
+                     // IPC in the browser process.
     RUN_LOCATION_LAST  // Leave this as the last item.
   };