Prerender: Disable prefetch if there's an appcache.

content/public/browser/appcache_service.h

Index: content/public/browser/appcache_service.h
diff --git a/content/public/browser/appcache_service.h b/content/public/browser/appcache_service.h
index 5daaa5858581f3d8bb3b20a9391a5ed1cc596510..bc2e83266862a6b0cb29bbc443e7add6cba9ec3b 100644
--- a/content/public/browser/appcache_service.h
+++ b/content/public/browser/appcache_service.h
@@ -14,6 +14,10 @@
 #include "content/public/common/appcache_info.h"
 #include "net/base/completion_callback.h"
 
+namespace net {
+class URLRequest;
+}  // namespace net
+
 namespace content {
 
 // Refcounted container to avoid copying the collection in callbacks.
@@ -47,6 +51,8 @@ class CONTENT_EXPORT AppCacheService {
   virtual void DeleteAppCacheGroup(const GURL& manifest_url,
                                    const net::CompletionCallback& callback) = 0;
 
+  static bool URLRequestHasActiveAppCache(const net::URLRequest* request);

[droger, 2017/02/07 10:40:38]

Nit: the style guide recommends const reference.

"In fact it is a very strong convention in Google code that input arguments are
values or const references while output arguments are pointers."

https://engdoc.corp.google.com/eng/doc/devguide/cpp/styleguide.shtml?cl=head#...

[mattcary, 2017/02/07 11:28:46]

Changed to nonconst * so that I don't have to change the AppCacheInterceptor
types. Sorry for the churn, an earlier iteration ran into so const thrashing.

+
  protected:
   virtual ~AppCacheService() {}
 };