Ground work for making appcache work in workers....

chrome/worker/webworkerclient_proxy.h

Index: chrome/worker/webworkerclient_proxy.h
===================================================================
--- chrome/worker/webworkerclient_proxy.h	(revision 45253)
+++ chrome/worker/webworkerclient_proxy.h	(working copy)
@@ -13,6 +13,8 @@
 #include "third_party/WebKit/WebKit/chromium/public/WebWorkerClient.h"
 
 namespace WebKit {
+class WebApplicationCacheHost;
+class WebApplicationCacheHostClient;
 class WebWorker;
 }
 
@@ -68,6 +70,12 @@
     return NULL;
   }
 
+  virtual WebKit::WebApplicationCacheHost* createApplicationCacheHost(
+      WebKit::WebApplicationCacheHostClient*) {
+    // TODO(michaeln): Create and initialize an appcache host for our worker.
+    return NULL;
+  }
+
   void EnsureWorkerContextTerminates();
 
  private: