Only commit cookie changes in prerenders after a prerender is shown

chrome/browser/prerender/external_prerender_handler_android.cc

Index: chrome/browser/prerender/external_prerender_handler_android.cc
===================================================================
--- chrome/browser/prerender/external_prerender_handler_android.cc	(revision 270027)
+++ chrome/browser/prerender/external_prerender_handler_android.cc	(working copy)
@@ -89,6 +89,17 @@
   return prerender_manager->HasPrerenderedUrl(url, web_contents);
 }
 
+static jboolean HasCookieStoreLoaded(JNIEnv* env,
+                                     jclass clazz,
+                                     jobject jprofile) {
+  Profile* profile = ProfileAndroid::FromProfileAndroid(jprofile);
+  prerender::PrerenderManager* prerender_manager =
+      prerender::PrerenderManagerFactory::GetForProfile(profile);
+  if (!prerender_manager)
+    return false;
+  return prerender_manager->cookie_store_loaded();
+}
+
 ExternalPrerenderHandlerAndroid::ExternalPrerenderHandlerAndroid() {}
 
 ExternalPrerenderHandlerAndroid::~ExternalPrerenderHandlerAndroid() {}