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..2516f33d310f203d3d02a4397a426c49f2fee9e8 100644
--- a/net/disk_cache/in_flight_backend_io.cc
+++ b/net/disk_cache/in_flight_backend_io.cc
@@ -105,6 +105,11 @@ void BackendIO::EndEnumeration(void* iterator) {
   iter_ = iterator;
 }
 
+void BackendIO::OnExternalCacheHit(const std::string& key) {
+  operation_ = OP_ON_EXTERNAL_CACHE_HIT;
+  key_ = key;
+}
+
 void BackendIO::CloseEntryImpl(EntryImpl* entry) {
   operation_ = OP_CLOSE_ENTRY;
   entry_ = entry;
@@ -218,6 +223,10 @@ void BackendIO::ExecuteBackendOperation() {
       backend_->SyncEndEnumeration(iter_);
       result_ = net::OK;
       break;
+    case OP_ON_EXTERNAL_CACHE_HIT:
+      backend_->SyncOnExternalCacheHit(key_);
+      result_ = net::OK;
+      break;
     case OP_CLOSE_ENTRY:
       entry_->Release();
       result_ = net::OK;
@@ -358,6 +367,12 @@ void InFlightBackendIO::EndEnumeration(void* iterator) {
   PostOperation(operation);
 }
 
+void InFlightBackendIO::OnExternalCacheHit(const std::string& key) {
+  scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, NULL));
+  operation->OnExternalCacheHit(key);
+  PostOperation(operation);
+}
+
 void InFlightBackendIO::CloseEntryImpl(EntryImpl* entry) {
   scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, NULL));
   operation->CloseEntryImpl(entry);