Inform disk cache of WebKit memory cache hits.

net/disk_cache/in_flight_backend_io.cc

Index: net/disk_cache/in_flight_backend_io.cc
diff --git a/net/disk_cache/in_flight_backend_io.cc b/net/disk_cache/in_flight_backend_io.cc
index 5d4be1890a69a758a077d577f61f7cbc4add2f4e..773dbeef595b39be70b4af0e14b3ed879de7f2de 100644
--- a/net/disk_cache/in_flight_backend_io.cc
+++ b/net/disk_cache/in_flight_backend_io.cc
@@ -182,6 +182,11 @@ void BackendIO::ReadyForSparseIO(EntryImpl* entry) {
   entry_ = entry;
 }
 
+void BackendIO::UpdateRankForExternalCacheHit(EntryImpl* entry) {
+  operation_ = OP_UPDATE_RANK;
+  entry_ = entry;
+}
+
 BackendIO::~BackendIO() {}
 
 // Runs on the background thread.
@@ -271,6 +276,10 @@ void BackendIO::ExecuteEntryOperation() {
     case OP_IS_READY:
       result_ = entry_->ReadyForSparseIOImpl(&my_callback_);
       break;
+    case OP_UPDATE_RANK:
+      entry_->UpdateRankForExternalCacheHitImpl();
+      result_ = net::OK;
+      break;
     default:
       NOTREACHED() << "Invalid Operation";
       result_ = net::ERR_UNEXPECTED;
@@ -436,6 +445,12 @@ void InFlightBackendIO::ReadyForSparseIO(EntryImpl* entry,
   PostOperation(operation);
 }
 
+void InFlightBackendIO::UpdateRankForExternalCacheHit(EntryImpl* entry) {
+  scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, NULL));
+  operation->UpdateRankForExternalCacheHit(entry);
+  PostOperation(operation);
+}
+
 void InFlightBackendIO::WaitForPendingIO() {
   InFlightIO::WaitForPendingIO();
 }