Support optimistic Create and Write operations on the SimpleCache.

net/disk_cache/cache_creator.cc

Index: net/disk_cache/cache_creator.cc
diff --git a/net/disk_cache/cache_creator.cc b/net/disk_cache/cache_creator.cc
index fb2bd34f4ece18a85e58d054e55a5e27cfcc0be7..acdf0551322fe22502b2af1dc5d697880eb71f05 100644
--- a/net/disk_cache/cache_creator.cc
+++ b/net/disk_cache/cache_creator.cc
@@ -81,6 +81,16 @@ int CacheCreator::Run() {
   // not belong to it.
   const std::string experiment_name =
       base::FieldTrialList::FindFullName("SimpleCacheTrial");
+
+  if (type_ == net::DISK_CACHE) {
+    disk_cache::SimpleBackendImpl* simple_cache =
+        new disk_cache::SimpleBackendImpl(path_, max_bytes_, type_, thread_,
+                                            net_log_);
+    created_cache_ = simple_cache;
+    return simple_cache->Init(
+        base::Bind(&CacheCreator::OnIOComplete, base::Unretained(this)));
+  }
+
   if (experiment_name == "ExplicitYes" || experiment_name == "ExperimentYes" ||
       experiment_name == "ExperimentYes2") {
     // TODO(gavinp,pasko): While simple backend development proceeds, we're only