Pages controlled by ServiceWorkers should not participate in AppCaching

content/browser/appcache/appcache_host.h

Index: content/browser/appcache/appcache_host.h
diff --git a/content/browser/appcache/appcache_host.h b/content/browser/appcache/appcache_host.h
index 4432e41c3978cf88ef6c04d1ca79513132e806a7..933ad483c80e71d474264a25628cac1d44ad9d3a 100644
--- a/content/browser/appcache/appcache_host.h
+++ b/content/browser/appcache/appcache_host.h
@@ -163,6 +163,10 @@ class CONTENT_EXPORT AppCacheHost
   AppCacheFrontend* frontend() const { return frontend_; }
   AppCache* associated_cache() const { return associated_cache_.get(); }
 
+  void enable_cache_selection(bool enable) {
+    is_cache_selection_enabled_ = enable;
+  }
+
   bool is_selection_pending() const {
     return pending_selected_cache_id_ != kAppCacheNoCacheId ||
            !pending_selected_manifest_url_.is_empty();
@@ -265,6 +269,9 @@ class CONTENT_EXPORT AppCacheHost
   int64 pending_selected_cache_id_;
   GURL pending_selected_manifest_url_;
 
+  // Used to avoid stepping on pages controlled by ServiceWorkers.
+  bool is_cache_selection_enabled_;
+
   // A new master entry to be added to the cache, may be empty.
   GURL new_master_entry_url_;